A) 15
B) 16
C) 17
D) 18
E) 21
Correct Answer: C
Solution :
Given, the projection of a line on x-axis is
...(i) on y-axis is, 
...(ii) on 2-axis, 
... (iii) On squaring and adding Eqs. (i), (ii) and (iii), 
Distance
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