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Prove that the following vectors are cop...

Prove that the following vectors are coplanar `-4hat(i) + 4hat(j) + 4hat(k), 4hat(i) + 5hat(j) + hat(k) - hat(j) - hat(k), 3hat(i) + 9hat(j) + 4hat(k)`.

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The correct Answer is:
A, B, C and D coplanar
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