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Q.
If P, Q, A, B are (1, 2, 5), (–2, 1, 3), (4, 4, 2) and (2, 1, –4) then the projection of PQ and AB is
A.
13/4
B.
2
C.
3
D.
4
E.
None of the above
View Answer
Correct choice: C
Explanation:
d.r. of AB is 2, 3, 6. Its d.c. is 2/7, 3/7, 6/7
∴Projection of PQ on AB = 2/7(1 + 2) + 3/7(2 - 1) + 6/7(5 - 3) = 3
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