Sum of n terms of the series 
is
Let S = √2 + √8 + √18 + √32 + ……..
It can be written as,
S = √2(1 + 2 + 3 + …….n)
We know that,
S 
S 
7
Sum of n terms of the series is
Let S = √2 + √8 + √18 + √32 + ……..
It can be written as,
S = √2(1 + 2 + 3 + …….n)
We know that,
S
S