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Question

Let U=2^i+^j^k,W=^i+3^k, if V is a unit vector,then the maximum value of [U,V,W] is

A
1
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B
10+6
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C
59
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D
60
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Solution

The correct option is C 59
[U,V,W]=U.(V×W)
=UV×W
=U×W from the question.
=^i^j^k211103
=^i(30)^j(6+1)+^k(01)
=3^i7^j^k
V×W=32+72+1=59
U=1(given)
[U,V,W]59

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