## The challenge

Implement a function that adds two numbers together and returns their sum in binary. The conversion can be done before or after the addition.

The binary number returned should be a string.

Examples:

 ``````1 2 `````` ``````add_binary(1, 1) == "10" (1 + 1 = 2 in decimal or 10 in binary) add_binary(5, 9) == "1110" (5 + 9 = 14 in decimal or 1110 in binary) ``````

## The solution in Python code

There are multiple ways to solve an `int to binary string` problem in Python.

Option 1:

 ``````1 2 `````` ``````def add_binary(a,b): return "{0:b}".format(a+b) ``````

Option 2:

 ``````1 2 `````` ``````def add_binary(a,b): return bin(a+b)[2:] ``````

Option 3:

 ``````1 2 `````` ``````def add_binary(a, b): return format(a + b, 'b') ``````

## Test cases to validate our solution

 `````` 1 2 3 4 5 6 7 8 9 10 11 12 `````` ``````import test from solution import add_binary @test.describe("Fixed Tests") def fixed_tests(): @test.it('Basic Test Cases') def basic_test_cases(): test.assert_equals(add_binary(1,1),"10") test.assert_equals(add_binary(0,1),"1") test.assert_equals(add_binary(1,0),"1") test.assert_equals(add_binary(2,2),"100") test.assert_equals(add_binary(51,12),"111111") ``````