Question

Finds Sn for each of the geometric a=2,t6=486,n=6

Answer 1

Answer:

Here a=2,t6=486,n=6

Now t6=2(r)5=486

⇒r5=243

⇒r=3.

Now, Sn=r−1a(rn−1) if r=1

Thus, S6=3−12(36−1)=36−1=728