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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