Question

If the mean of first $n$ odd natural number be $n$ , then mean of first $2n$ odd natural numbers be

• A. $n$
• B. $2n$
• C. $n+1$
• D. None of these

Answer 1

Answer: (B)

$2n$

Required mean
$=\frac{1+3+5+7+...............+2n}{2n}(as1,3,,\mathrm{5...}formsAP)=\frac{\frac{2n}{2}(2.1+(2n-1\left).2\right)}{2n}=\frac{4n}{2}=2n$