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Question

The harmonic mean of a1−ab and a1+ab is
[MP PET 1996; Pb. CET 2001]

A
a1a2b2
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B
a1a2b2
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C
a
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D
11a2b2
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Solution

The correct option is C a
H.M.=2(a21a2b2)a1ab+a1+ab=2a22a=a.

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