Question

The mean of first "n" odd natural numbers is n²/81, then n= a)81. b)18. c)27. d)54​

Answer 1

Answer:

A) 81

Step-by-step explanation:

We know that, the sum of first n natural odd numbers is = $n^{2}$

also we know that the mean = sum of observation / number of observation

Mean = $\frac{n^{2} }{n}$

given mean =  $\frac{n^{2} }{81}$

$\frac{n^{2} }{81}$ = $\frac{n^{2} }{n}$

on comparing, $n^{2}$ gets cancelled and we get n=81

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