The sum of first 20 odd natural numbers is ______.

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200

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250

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400

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Solution

The correct option is D 400
We know that , Sum of first n odd natural numbers is $n^{2}$
Sum of first 20 odd natural numbers is $20^{2} = 400$

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The sum of first 20 odd natural numbers is:

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

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