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If three vectors a,b,c are such that `a !=0` and `a xx b = 2 (a xx c), |a| = |c| = 1, |b| = 4` and the angle between b and c is `cos^(-1)` (1/4), then b - 2c = `lambda` a where `lambda` =

A

4

B

3

C

2

D

1

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A
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