Question

Find the sum of the following series upto 9th term 2 8 14 is 98

Answer 1

now the series are 2+8+14+.......98

which is 9th term

sum of n terms in ap

now numbers of terms is 9

a is first term is 2

d is common difference is 6

s=n/2(2a+(n-1)d)

=9/2(4+48)

9/2(52)

9(26)

=234