If (2, -1, 2) and (K, 3, 5) are the triads of direction ratios of two lines and the angle between them is 45^{\circ

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Q 1565880765.     If (2, -1, 2) and (K, 3, 5) are the triads of direction ratios of two lines and the angle between them is 45^{\circ}, then a value of K is
EAMCET 2015
A

2

B

3

C

4

D

6`

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