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Let \(\left\{a_k\right\}\) and \(\left\{b_k\right\}, k \in N\), be two G.P.s with common ratio \(r_1\) and \(r_2\) respe…

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Let \(\left\{a_k\right\}\) and \(\left\{b_k\right\}, k \in N\), be two G.P.s with common ratio \(r_1\) and \(r_2\) respectively such that \(a_1=b_1=4\) and \(r_1

a

9

b

6

c

7

d

3

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