# NCERT Class 11 Mathematics Solutions: Chapter 9 –Sequences and Series Miscellaneous Exercise 9 Part 7

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1. If then show that are in G.P.

It is given that,

…………… eq (1)

Also,

………………..eq (2)

From eq (1) and (2)

So, are in G.P.

2. Let be the sum, the product and the sum of reciprocals of n terms in a G.P. Prove that: