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

If `a=hati+2hatj+3hatk,b=-hati+2hatj+hatk and c=3hati+hatj`. If `(a+tb) bot c`, then t is equal to

A

5

B

4

C

3

D

2

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The correct Answer is:

A

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