If (2,-1,2) and (k,3,5) are the triads of direction ratios of two lines and the angle between them is $45^{0}$ , then a value of k is

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Solution

The correct option is B 4
$\frac{1}{\sqrt{2}} = \frac{2 k - 3 + 10}{3 \times \sqrt{k^{2} + 34}}$
verification $k = 4$

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