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Question

If a2+b2=41 and ab=4, then find ab.

A
35
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B
6
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C
33
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D
7
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Solution

The correct option is B 33

Formula (ab)2=a2+b22ab
Given, a2+b2=41 and ab=4
So, (ab)2=a2+b22ab=412×4=418=33


=>ab=33


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