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Formula for Sum of n Terms of an AP

The sum fo fi...

Question

The sum fo first 20 odd natural numbers is
(a) 100 (b) 210 (c) 400 (d) 420

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Solution

The sum of n odd numbers = $n^{2}$
=)sum of 1st 20 odd numbers = $(20)^{2} = 400$

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