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If a=hati+2hatk+3hatk, b=-hati+2hatj = h...

If `a=hati+2hatk+3hatk, b=-hati+2hatj = hatk` and `c=3hati+hatj`, then p such that `a+pb` is at right angle to c will be

A

7

B

9

C

3

D

5

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The correct Answer is:
D
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