Question

III Short Answer questions
(1) Find the sum of first 15 terms of an Arithmetic Series 5+ 8 + 11 + ...
using suitable formula .​

Answer 1

Answer:

hey mate here is your answer

so frnd your sum is 390

formula is S=n/2(2a+(n-1)(d)

I hope u get your answer

plzz mark as brainlist...

Answer 2

hope it helps you see the attachment for further information .....