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Question

Without adding, find the sum of 1 + 3 + 5 + 7 + 9.


A

16

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B

9

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C

36

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D

25

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Solution

The correct option is D

25


The sum of first n consecutive odd numbers starting from 1 is given by then2.

So, 1+3+5+7+9=52 as n=5.

1+3+5+7+9=25


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