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Question

IF 2x+y=3 , xy=1 , then the value of 8x3+y3 is

A
16
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B
9
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C
4
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D
1
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Solution

The correct option is A 9
2x+y=3
or (2x+y)3=27
or 8x3+y3+6xy (2x+y)=27
or 8x3+y3+6×1×3=27
or 8x3+y3=9

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