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Question

If a×b=c×d and a×c=b×d, then ad,bc are

A
Parallel
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B
Perpendicular
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C
Are inclined at an angle of 450
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D
Are inclined at an angle of 600
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Solution

The correct option is A Parallel
Given that
a×b=c×d1
a×c=b×d2
Subtract (1)(2)
a×(bc)=(cd)×d
(ad)×(bc)=0
So (ad)(bc)

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