Find the 12th term of a G.P. whose 8th term is 192 and the common ratio is 2.
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)
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5 Comment(s) on this Question
S.I. for 1 year = Rs. (2124-2016) = Rs. 108. S.I. for 2 years = Rs.(108 x 2) = Rs. 216. We know that, A = P + S.I. So, A = 2016 S.I. = 216 Principal, P = Rs. (2016-216) = Rs. 1800.
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The ratio of 12th term to 15th term of a G.P. is 8 : 1. What is the common ratio of G.P?
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