If the angle between the lines whose direction ratios are 2,?1 , 2 and a, 3, 5 be \[45{}^\circ \], then a =

If the angle between the lines whose direction ratios are �

1.	If the angle between the lines whose direction ratios are 2,?1 , 2 and a, 3, 5 be \[45{}^\circ \], then a =
A.	1
B.	2
C.	3
D.	4
Answer» E.

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If the angle between the lines whose direction ratios are 2,?1 , 2 and a, 3, 5 be \[45{}^\circ \], then a =

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