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Which of the triplet can not represent d...

Which of the triplet can not represent direction cosines of a line ?

A

(a) `(1)/(sqrt(3)),(1)/(sqrt(3)),(1)/(sqrt(3))`

B

(b) `(3)/(sqrt(50)),(4)/(sqrt(50)),(4)/(sqrt(50))`

C

(c) `(4)/(sqrt(77)),(5)/(sqrt(77)),(6)/(sqrt(77))`

D

(d) `(2)/(sqrt(25)),(3)/(sqrt(25)),(4)/(sqrt(25))`

Text Solution

Verified by Experts

The correct Answer is:
D
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