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Question

If ab=3 and a3 - b3 =117 ,then ab = _________


A

90

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B

9

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C

10

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D

27

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Solution

The correct option is C

10


Given ab=3

Cubing both sides, we get:

a3b33ab(ab)=27

Substituting the values of (a3b3=117) and (ab=3)

1173ab(3)=27

9ab=90

ab=10


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