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**If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =**

A. $\frac{1}{n}$
B. $\frac{n-1}{n}$
C. $\frac{n+1}{2 n}$
D. $\frac{n+1}{n}$
**Answer: Option D**

## Show Answer

Solution(By Apex Team)

Sum of n even natural number = n(n+1)
and sum of n odd natural numbers = $n^{2}$
$\begin{aligned}\therefore n(n+1)&=kn^2\\
\Rightarrow k&=\frac{n(n+1)}{n^2}\\
&=\frac{n+1}{n}\end{aligned}$

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