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Question

If the roots of x3kx2+148=0 are in geometric progession, then k=

A
3
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B
7
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C
4
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D
0
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Solution

The correct option is B 7

Let ar,a,ar be the roots

ar.a.ar=8a3=8a=2

a=2 is a root of given equation

84k+288=0k=7


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