BITSAT 2015 Paper

Section: Mathematics
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Question : 94 of 150
 
Marks: +1, -0
Let a, b and c be three vectors satisfying a × b = (a ×c), |a| = |c| = 1, |b| = 4 and |b × c| = 15 . If b – 2c = λa, then λ equals
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