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Question

The value of k such that x41=y21=zk2 lies in the plane 2x -4y +z =7, is

A
7
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B
-7
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C
No real value
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D
4
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Solution

The correct option is A 7
Point (4, 2, k) should lie in the given plane
2(4)4(2)+1(k)=7k=7.

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