Question

Find sum of first 5 terms of the G.P 2, 8, 32,

Answer 1

Answer:

Hope it will help you:-)

Step-by-step explanation:

Here a = 2

r = 8/2= 4

n = 5

Sn  = a(rn^-1)/(r-1)  

= 2(45 -1)/(4-1)

= 2(45 -1)/3

= 682

Hence the required sum is 682.

Answer 2

Answer:

We have : a= 2 , r =8/2= 4 , n=5

S= a(r^n -1)/r-1 = 2(4⁵-1)/4-1

=2×255/3 = 510/3=170

hence, sum of first 5 terms of given GP is 170