Question

If the sum of the first n terms of a series is 5n2 + 5n then its second term is

Answer 1

Step-by-step explanation:

Let us calculate the first term. So, put n=1 in the expression

5(1)^2 +2(1)=5(1)+2=5+2=7

So 7 is the first term of the series.

Now if we put n=2 then,

5(2)^2+2(2)=5(4)+4=20+4=24

As, given expressionin the question is the expression to calculate the sum of n terms of a series. So 24 is the sum of first two terms of the series.

As first term is 7 then second term will be

24–7=17

So, 17 is the second term in the given series