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If absa = absb = 1 and abs(a + b) = sqrt...

If `absa = absb = 1` and `abs(a + b) = sqrt3` then the value of `(3a - 4b) cdot (2a + 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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