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If veca=hati+3hatj+hatk, vecb=2hati-hat...

If `veca=hati+3hatj+hatk, vecb=2hati-hatj-hatk` and `vec c=m hati+7hatj+3hatk` are coplanar, then the value of m is -

A

m = -2

B

m = 0

C

m = 1

D

m = 3

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The correct Answer is:
B
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