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Vector vec c is perpendicular to vector...

Vector ` vec c` is perpendicular to vectors ` vec a=(2,-3,1)a n d vec b=(1,-2,3)` and satisfies the condition ` vec cdot( hat i+2 hat j-7 hat k)=10.` Then vector ` vec c` is equal to `(7,5,1)` b. `-7,-5,-1` c. `1,1,-1` d. none of these

A

`(7, 5, 1)`

B

`(-7,, -5, -1)`

C

`(1, 1, -1)`

D

None of these

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The correct Answer is:
B
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