Question

the 1st term of an Ap is is 4 and the common difference is 9 find the sum of first 15 terms of an ap ​

Answer 1

Answer:

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

15/2(8+14*9)

15/2(8+126)

15/2(132)

15(67)

1005. Ans..