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Question

If log2xlog3xlog5x=log2xlog3x+log3xlog5x+log5xlog2x, then value of x which satisfies the given equation is

A
1
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B
30
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C
5
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D
6
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Solution

The correct options are
A 1
B 30
log2xlog3xlog5x=log2xlog3x+log3xlog5x+log5xlog2x
Divide both sides by log2xlog3xlog5x
1=1log5x+1logx2+1logx3
1=1logx/log5+1logx/log2+1logx/log3
1=log5logx+log2logx+log3logx
1=(log5+log2+log3)/logx
1=[log(5.2.3)]/logx
logx=log30
x=30

1476641_137364_ans_89bfc552ef074378bae4021cec60e61b.jpg

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