Your task is to find the missing number.

 # prompt: You are given an array of size N-1 containing distinct numbers from 1 to N. This means one number from the range 1 to N is missing. Your task is to find the missing number.


def find_missing_number(arr):

    n = len(arr) + 1  # Calculate the expected size of the array

    expected_sum = n * (n + 1) // 2  # Calculate the sum of numbers from 1 to N

    actual_sum = sum(arr)  # Calculate the sum of the given array elements

    missing_number = expected_sum - actual_sum  # Find the missing number

    return missing_number


# Example usage:

arr = [1, 2, 4, 6, 3, 7, 8]

missing_num = find_missing_number(arr)

print(f"The missing number is: {missing_num}")


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