find_missing_number.py

# Find missing number
def find_missing_number(nums):
    n = len(nums ) + 1
    total = n * (n + 1) // 2
    actual_sum = sum(nums)
  
    return total - actual_sum

nums = [1, 3, 2, 6, 4]
missing = find_missing_number(nums)
print(missing) # 5