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The sum of the all values of  , for which the points whose position vectors are k ˆ 3 j ˆ 2 – i ˆ  , k ˆ 4 j ˆ 3 – i ˆ 2  , k ˆ 2 i ˆ ) 1 (    and k ˆ 6 j ˆ ) 8 – ( i ˆ 9    are coplanar, is equal to

1. –2
2. 2
3. 6
4. 4

Correct answer: 2

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