Q.

If the mean of first n odd natural numbers is n281,

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a

9

b

81

c

27

d

none of these

answer is B.

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Detailed Solution

It is given that1+3+5+7+…+(2n−1)n=n281⇒n2n=n281⇒n=81
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If the mean of first n odd natural numbers is n281,