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Question

If AM and HM of two numbers are 27 and 12 respectively, then their GM is:

A
9
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B
18
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C
24
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D
36
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Solution

The correct option is A 18
Let a and b be two numbers, then
AM=a+b2
27=a+b2
a+b=54
and HM=2aba+b
12=2ab54
ab=324
GM=ab=324=18

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