# Python: Check whether the sum of any two numbers from the list is equal to k or not

## Python Basic - 1: Exercise-64 with Solution

Given a list of numbers and a number k, write a Python program to check whether the sum of any two numbers from the list is equal to k or not.

For example, given [1, 5, 11, 5] and k = 16, return true since 11 + 5 is 16.

**Sample Solution**:

**Python Code:**

```
# Function to check if there exists a pair in the list whose sum is equal to the given value 'k'
def check_sum(nums, k):
# Loop through each element in the list
for i in range(len(nums)):
# Nested loop to compare each element with subsequent elements
for j in range(i+1, len(nums)):
# Check if the sum of the current pair is equal to 'k'
if nums[i] + nums[j] == k:
return True # Return True if such a pair is found
return False # Return False if no such pair is found
# Test cases
print(check_sum([12, 5, 0, 5], 10))
print(check_sum([20, 20, 4, 5], 40))
print(check_sum([1, -1], 0))
print(check_sum([1, 1, 0], 0))
```

Sample Output:

True True True False

**Explanation: **

Here is a breakdown of the above Python code:

- Define a function named "check_sum()" that takes a list of numbers (nums) and a target sum (k) as input.
- Use a nested loop to iterate through each pair of elements in the list.
- Check if the sum of the current pair is equal to the target sum (k).
- If such a pair is found, return 'True'.
- If no such pair is found after checking all pairs, return 'False'.
- Test the function with different inputs to check its functionality.

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