If the vectors hat(i)-2hat(j)+hat(k),aha...

If the vectors `hat(i)-2hat(j)+hat(k),ahat(i)+5hat(j)-3hat(k)and5hat(i)-9hat(j)+4hat(k)` are coplanar, then the value of a is

A

3

B

`-3`

C

2

D

`-2`

Verified by Experts

The correct Answer is:

D

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