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Question

If |a|=3, |¯¯b|=4 and ¯¯¯a.¯¯b=8, then |¯¯¯aׯ¯b|=

A
4
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B
6
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C
8
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D
80
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Solution

The correct option is C 80
a×b2+(ab)2=|a|2b2
a×b2+64=144
a×b=80

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