### Program to find the deleted number from an array

Suppose you have an array of number 1-50 in random order. The

**number in an array is not repeated**. One number is deleted from an array find the deleted number.

**Logic of a Program**1. The number is not repeated so we can calculate the sum of first 50 number. The sum of number is

**n(n+1)/2 = 50*(50+1)/2**

2. Now one number is deleted from an array, calculate the sum of remaining number using single pass

int sum =0; for(int i=0;i<49;i++){ sum = sum + arr[i]; }

Now

**subtract this sum to the original sum**. You will find the missing number.

Hope this is useful. If you know any other solution please comment below.

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