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Question

Without adding, find the sum of the following numbers

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 =

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Solution

We know, sum of n odd numbers =n²
In the given question, the number of consecutive odd numbers=9
So the sum of these numbers=9²4
9×9=81
So the sum of the given numbers=81

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