Write the sum of first n even natural numbers.


Write the sum of first n even natural numbers.


We need to find the sum of 2, 4, 6, 8...upto terms.

Here, = 2, d = 2

We know:

$S_{n}=\frac{n}{2}\{2 a+(n-1) d\}$

$=\frac{n}{2}\{2 \times 2+(n-1) 2\}$


Therefore, the sum of the first $n$ odd numbers is $n(n+1)$.


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