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Let O be the origin and the position vector of the point P be k 3 j ˆ 2 i ˆ    . If the position vectors of the points A, B and C are k 3 j ˆ i ˆ 2    , k 2 j ˆ 4 i ˆ 2   and k j ˆ 2 i ˆ 4    respectively, then the projection of the vector OP on a vector perpendicular to the vectors AB and AC is

1. 3
2. 3 8
3. 3 7
4. 3 10

Correct answer: 3

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