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Let a,b,c be three vectors such that a ...

Let a,b,c be three vectors such that `a ne 0` and `a xx b = 2a xx c,|a| = |c| = 1, |b| = 4 and |b xx c| = sqrt(15)`. If `b - 2 c = lambda a,` then `lambda` is equal ot

A

1

B

`pm 4`

C

3

D

`-2`

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The correct Answer is:
B
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