Question

if the sum of the the 1st n terms of an ap is 5n2-2n. find the 2nd term​

Answer 1

answer 17

Step-by-step explanation:

By substituting n by 1 and 2 we will get the first number of the series and the sum of the first two numbers of the series. Hence, the second term is 17

Answer 2

Answer:

It is given that; the sum of first n

terms of a series be 5n2+2n

.

We have to find the second term.

To solve the sum, we have to find the first term and the sum of the first two numbers.

By substituting n by 1 and 2 we will get the first number of the series and the sum of the first two numbers of the series.

Now, substituting n=1

we get,

First term is,

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

Again, substituting n=1

we get,

Sum of first two terms is,

5(2)2+2(2)=24

So, the second term is 24−7=17

Hence, the second term is 17