Question

(a) The first term and the last term of a G.P. are a and k respectively. If the number of terms be n, prove that n = 1+log k-log a\log r
where r is the common ratio.
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Answer 1

Answer:

Do remember the following formulas:

•nth term of a G.P having first term a and common ratio r:an=ar^(n-1).

•log(a.b)=loga+logb.

•log(a)^b=bloga.