Question

Find the 12th term of a G.P. whose 8th term is 192 and the common ratio is 2.

Answer 1

Common ratio, r = 2
Let a be the first term of the G.P.
∴ a8 = ar 8–1 = ar7 ⇒ ar7 = 192 a(2)7 = 192 a(2)7 = (2)6 (3)