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Question

Geometric mean of 7, 72, 73....7n is

A
7(n+1)2
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B
7n/2
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C
7(n1)2
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D
7n+13
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Solution

The correct option is A 7(n+1)2
Gm of two no a & b=ab
For aGP
GM=a1.an
GM of 7,72,.....7n
=7.7n
=7(n+1)2

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