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Question

If three geometric means are inserted between 2 and 32, then the third geometric mean will be


A

8

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B

4

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C

16

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D

12

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Solution

The correct option is C

16


Let 2,g1,g2,g3, 32 be the required series. then,

a=2, ar=g1,ar2=g2,ar3=g3 and ar4=32
Now 2 × r4=32r4=16

(2)4=16=(2)4r=2.
Then third geometric mean ar2=2×23=16.


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