Question

4
The nth term of an A.P. is 2n + 7. Find
sum of the first four terms​

Answer 1

Answer:

nth term 2n + 7

then ,

1st term = 2(1) + 7 = 9

2nd term = 2(2) + 7 = 11

3rd term = 2(3) + 7 = 13

4th term = 2(4) + 7 = 15

so sum of first four terms

= 9+11+13+15

= 48