Missing Number Python

PROGRAM TO FIND THE MISSING INTEGERS IN GIVEN LIST



# getMissingNo takes list as argument 
def getMissingNo(a, n):
    n_elements_sum=n*(n+1)//2
    return n_elements_sum-sum(a)
  
  
# Driver program to test above function
if __name__=='__main__':
  
    a = [1, 2, 4, 5, 6]
    n = len(a)+1
    miss = getMissingNo(a, n) 
    print(miss)


OUTPUT
3

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