diff --git a/solutions/result-panic/result.md b/solutions/result-panic/result.md
new file mode 100644
index 0000000..0babab9
--- /dev/null
+++ b/solutions/result-panic/result.md
@@ -0,0 +1,177 @@
+1.
+```rust
+use std::num::ParseIntError;
+
+fn multiply(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    let n1 = n1_str.parse::<i32>();
+    let n2 = n2_str.parse::<i32>();
+    Ok(n1.unwrap() * n2.unwrap())
+}
+
+fn main() {
+    let result = multiply("10", "2");
+    assert_eq!(result, Ok(20));
+
+    let result = multiply("4", "2");
+    assert_eq!(result.unwrap(), 8);
+
+    println!("Success!")
+}
+```
+
+2.
+```rust
+use std::num::ParseIntError;
+
+// IMPLEMENT multiply with ?
+// DON'T use unwrap here
+fn multiply(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    let n1 = n1_str.parse::<i32>()?;
+    let n2 = n2_str.parse::<i32>()?;
+    Ok(n1 * n2)
+}
+
+fn main() {
+    assert_eq!(multiply("3", "4").unwrap(), 12);
+    println!("Success!")
+}
+```
+
+3.
+```rust
+use std::fs::File;
+use std::io::{self, Read};
+
+fn read_file1() -> Result<String, io::Error> {
+    let f = File::open("hello.txt");
+    let mut f = match f {
+        Ok(file) => file,
+        Err(e) => return Err(e),
+    };
+    
+    let mut s = String::new();
+    match f.read_to_string(&mut s) {
+        Ok(_) => Ok(s),
+        Err(e) => Err(e),
+    }
+}
+
+fn read_file2() -> Result<String, io::Error> {
+    let mut s = String::new();
+
+    File::open("hello.txt")?.read_to_string(&mut s)?;
+
+    Ok(s)
+}
+
+fn main() {
+    assert_eq!(read_file1().unwrap_err().to_string(), read_file2().unwrap_err().to_string());
+    println!("Success!")
+}
+```
+
+4.
+```rust
+use std::num::ParseIntError;
+
+fn add_two(n_str: &str) -> Result<i32, ParseIntError> {
+   n_str.parse::<i32>().map(|num| num +2)
+}
+
+fn main() {
+    assert_eq!(add_two("4").unwrap(), 6);
+
+    println!("Success!")
+}
+```
+
+```rust
+use std::num::ParseIntError;
+
+fn add_two(n_str: &str) -> Result<i32, ParseIntError> {
+   n_str.parse::<i32>().and_then(|num| Ok(num +2))
+}
+
+fn main() {
+    assert_eq!(add_two("4").unwrap(), 6);
+
+    println!("Success!")
+}
+```
+
+5.
+```rust
+use std::num::ParseIntError;
+
+// With the return type rewritten, we use pattern matching without `unwrap()`.
+// But it's so Verbose..
+fn multiply(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    match n1_str.parse::<i32>() {
+        Ok(n1)  => {
+            match n2_str.parse::<i32>() {
+                Ok(n2)  => {
+                    Ok(n1 * n2)
+                },
+                Err(e) => Err(e),
+            }
+        },
+        Err(e) => Err(e),
+    }
+}
+
+// Rewriting `multiply` to make it succinct
+// You  MUST USING `and_then` and `map` here
+fn multiply1(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    // IMPLEMENT...
+    n1_str.parse::<i32>().and_then(|n1| {
+        n2_str.parse::<i32>().map(|n2| n1 * n2)
+    })
+}
+
+fn print(result: Result<i32, ParseIntError>) {
+    match result {
+        Ok(n)  => println!("n is {}", n),
+        Err(e) => println!("Error: {}", e),
+    }
+}
+
+fn main() {
+    // This still presents a reasonable answer.
+    let twenty = multiply1("10", "2");
+    print(twenty);
+
+    // The following now provides a much more helpful error message.
+    let tt = multiply("t", "2");
+    print(tt);
+
+    println!("Success!")
+}
+```
+
+6.
+```rust
+use std::num::ParseIntError;
+
+// Define a generic alias for a `Result` with the error type `ParseIntError`.
+type Res<T> = Result<T, ParseIntError>;
+
+// Use the above alias to refer to our specific `Result` type.
+fn multiply(first_number_str: &str, second_number_str: &str) -> Res<i32> {
+    first_number_str.parse::<i32>().and_then(|first_number| {
+        second_number_str.parse::<i32>().map(|second_number| first_number * second_number)
+    })
+}
+
+// Here, the alias again allows us to save some space.
+fn print(result: Res<i32>) {
+    match result {
+        Ok(n)  => println!("n is {}", n),
+        Err(e) => println!("Error: {}", e),
+    }
+}
+
+fn main() {
+    print(multiply("10", "2"));
+    print(multiply("t", "2"));
+}
+```
\ No newline at end of file
diff --git a/src/result-panic/result.md b/src/result-panic/result.md
index 7af6baf..064277b 100644
--- a/src/result-panic/result.md
+++ b/src/result-panic/result.md
@@ -1 +1,212 @@
 # result and ?
+`Result<T>` is an enum to describe possible errors. It has two variants: 
+
+- `Ok(T)`: a value T was found
+- `Err(e)`: An error was found with a value `e`
+
+In short words, the expected outcome is `Ok`, while the unexpected outcome is `Err`.
+
+1. 🌟🌟
+```rust,editable
+
+// FILL in the blanks and FIX the errors
+use std::num::ParseIntError;
+
+fn multiply(n1_str: &str, n2_str: &str) -> __ {
+    let n1 = n1_str.parse::<i32>();
+    let n2 = n2_str.parse::<i32>();
+    Ok(n1.unwrap() * n2.unwrap())
+}
+
+fn main() {
+    let result = multiply("10", "2");
+    assert_eq!(result, __);
+
+    let result = multiply("t", "2");
+    assert_eq!(result.__, 8);
+
+    println!("Success!")
+}
+```
+
+### ? 
+`?` is almost exactly equivalent to `unwrap`, but `?` returns instead of panic on `Err`.
+
+2. 🌟🌟
+```rust,editable
+
+use std::num::ParseIntError;
+
+// IMPLEMENT multiply with ?
+// DON'T use unwrap here
+fn multiply(n1_str: &str, n2_str: &str) -> __ {
+}
+
+fn main() {
+    assert_eq!(multiply("3", "4").unwrap(), 12);
+    println!("Success!")
+}
+```
+
+3. 🌟🌟
+```rust,editable
+
+use std::fs::File;
+use std::io::{self, Read};
+
+fn read_file1() -> Result<String, io::Error> {
+    let f = File::open("hello.txt");
+    let mut f = match f {
+        Ok(file) => file,
+        Err(e) => return Err(e),
+    };
+
+    let mut s = String::new();
+    match f.read_to_string(&mut s) {
+        Ok(_) => Ok(s),
+        Err(e) => Err(e),
+    }
+}
+
+// FILL in the blanks with one code line
+// DON'T change any code else
+fn read_file2() -> Result<String, io::Error> {
+    let mut s = String::new();
+
+    __;
+
+    Ok(s)
+}
+
+fn main() {
+    assert_eq!(read_file1().unwrap_err().to_string(), read_file2().unwrap_err().to_string());
+    println!("Success!")
+}
+```
+
+### map & and_then
+[map](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.map) and [and_then](https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.and_then) are two common combinators for `Result<T, E>` (also for `Option<T>`).
+
+4. 🌟🌟 
+
+```rust,editable
+use std::num::ParseIntError;
+
+// FILL in the blank in two ways: map, and then
+fn add_two(n_str: &str) -> Result<i32, ParseIntError> {
+   n_str.parse::<i32>().__
+}
+
+fn main() {
+    assert_eq!(add_two("4").unwrap(), 6);
+
+    println!("Success!")
+}
+```
+
+5. 🌟🌟🌟
+```rust,editable
+use std::num::ParseIntError;
+
+// With the return type rewritten, we use pattern matching without `unwrap()`.
+// But it's so Verbose..
+fn multiply(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    match n1_str.parse::<i32>() {
+        Ok(n1)  => {
+            match n2_str.parse::<i32>() {
+                Ok(n2)  => {
+                    Ok(n1 * n2)
+                },
+                Err(e) => Err(e),
+            }
+        },
+        Err(e) => Err(e),
+    }
+}
+
+// Rewriting `multiply` to make it succinct
+// You should use BOTH of  `and_then` and `map` here.
+fn multiply1(n1_str: &str, n2_str: &str) -> Result<i32, ParseIntError> {
+    // IMPLEMENT...
+}
+
+fn print(result: Result<i32, ParseIntError>) {
+    match result {
+        Ok(n)  => println!("n is {}", n),
+        Err(e) => println!("Error: {}", e),
+    }
+}
+
+fn main() {
+    // This still presents a reasonable answer.
+    let twenty = multiply1("10", "2");
+    print(twenty);
+
+    // The following now provides a much more helpful error message.
+    let tt = multiply("t", "2");
+    print(tt);
+
+    println!("Success!")
+}
+```
+
+### Type alias
+Using `std::result::Result<T, ParseIntError>` everywhere is verbose and tedious, we can use alias for this purpose.
+
+At a module level, creating aliases can be particularly helpful. Errors found in the a specific module often has the same `Err` type, so a single alias can succinctly defined all associated `Results`. This is so useful even the `std` library even supplies one: [`io::Result`](https://doc.rust-lang.org/std/io/type.Result.html).
+
+6. 🌟
+```rust,editable
+use std::num::ParseIntError;
+
+// FILL in the blank
+type __;
+
+// Use the above alias to refer to our specific `Result` type.
+fn multiply(first_number_str: &str, second_number_str: &str) -> Res<i32> {
+    first_number_str.parse::<i32>().and_then(|first_number| {
+        second_number_str.parse::<i32>().map(|second_number| first_number * second_number)
+    })
+}
+
+// Here, the alias again allows us to save some space.
+fn print(result: Res<i32>) {
+    match result {
+        Ok(n)  => println!("n is {}", n),
+        Err(e) => println!("Error: {}", e),
+    }
+}
+
+fn main() {
+    print(multiply("10", "2"));
+    print(multiply("t", "2"));
+
+    println!("Success!")
+}
+```
+
+### Using Result in `fn main`
+Typically `the` main function will look like this: 
+```rust
+fn main() {
+    println!("Hello World!");
+}
+```
+
+However `main` is also able to have a return type of `Result`. If an error occurs within the `main` function it will return an error code and print a debug representation of the error( Debug trait ).
+
+The following example shows such a scenario:
+```rust,editable
+
+use std::num::ParseIntError;
+
+fn main() -> Result<(), ParseIntError> {
+    let number_str = "10";
+    let number = match number_str.parse::<i32>() {
+        Ok(number)  => number,
+        Err(e) => return Err(e),
+    };
+    println!("{}", number);
+    Ok(())
+}
+```
\ No newline at end of file