Q.

The geometric mean of 3,32…,3n is

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a

3n/2

b

3(n+1)/2

c

3n(n+1)/2

d

none of these

answer is B.

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Detailed Solution

G.M. =3⋅32⋅33…3n1/n=31+2+…+n1/n=3n(n+1)21/n=3(n+1)/2
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