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How do you find the missing number in a given integer array of 1 to 100?

def getMissingNo(A):
    n = len(A)
    total = (n + 1)*(n + 2)/2
    sum_of_A = sum(A)
    return total - sum_of_A
 
A = [1, 2, 4, 5, 6]
miss = getMissingNo(A)
print(miss)

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How do you find the missing number in a given integer array of 1 to 100?

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