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If vec a and vec b are mutually perpendi...

If `vec a` and `vec b` are mutually perpendicular unit vectors, then (3`vec a` + 2`vec b`). (5`vec a` - 6 `vec b`)= `

A

5

B

3

C

6

D

12

Text Solution

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The correct Answer is:
B
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HIMALAYA PUBLICATION-COMMON ENTRANCE TEST - 2018-QUESTION BANK
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