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If |a|=|b|=1 and |a+b|=sqrt(3), then the...

If `|a|=|b|=1 and |a+b|=sqrt(3)`, then the value of `(3a-4b)(2b+5b)` is

A

`-21`

B

`-21//2`

C

21

D

`21//2`

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The correct Answer is:
B
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