Without adding the numbers, find the sum of 1 + 3 + 5 + 7.

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Solution

The correct option is A 16
There are 4 consecutive odd numbers.
We know the formula for consecutive odd numbers of their sum = $n^{2}$
So, sum = $4^{2}$ = 16
So, 1 + 3 + 5 + 7 = 16.

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