# Find missing numbers in an array 
arr=[]size = int(input("Enter the size of the array: "))print("Enter the Element of the array:")for i in range(0,size):    num = int(input())    arr.append(num)sum=0for i in range(0,size):    sum += arr[i]size2=size+1miss=int((size2*(size2+1))/2)print("Missing Number is: ",abs(miss-sum))