Mathematics

Find the sum of the first five terms of the G.P 2,6, 18 ….

Find the sum of the first five terms of the G.P 2,6, 18 ….

  • A.
    484
  • B.
    243
  • C.
    242
  • D.
    130
  • E.
    121
Correct Answer: Option C
Explanation

(S_{n} = frac{a(r^n – 1)}{r – 1})

a = 2; r = 6/2 = 3.

(S_{5} = frac{2(3^5 – 1)}{3 – 1})

= (243 – 1 = 242)