If the angle between the lines whose direction ratios are 2, -1, 2 and x, 3, 5 is 4 , then the smaller value of x is

NDA 2017 Mathematics question

If the angle between the lines whose direction ratios are and is , then the smaller value of x is

Answer: (B)

$ = = ⇒ 2(2x+ = +34)

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Question ID VK-028744