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Question

The harmonic mean of a1ab and a1+ab is

A
a
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B
a1a2b2
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C
11a2b2
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D
a1+a2b2
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Solution

The correct option is B a
Here, n=2
x1=a1ab and x2=a1+ab
Then, 1x1=1aba and 1x2=1+aba

Harmonic mean =n1x1+1x2

=21aba+1+aba

=2a2

=a

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