The 14th term of an AP is twice its 8th term. If
its 6th term is -8, then find the sum of its first
20 terms.
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The 5th term of a GP is ar^4 = 81 …(1)
The 8th term of a GP is ar^7 = 2187 …(2)
Divide (2) by (1) to get
r^3 = 2187/81 = 27, or
r = 3 and a = 1
The GP has the first term as 1 and the common ratio as 3.
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