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If a,b,c and d are four real numbers of the same sign, then the value of `(a)/(b)+(b)/(c )+(c )/(d)+(d)/(a)` lies in the interval

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If a,b,c and d are four real numbers of the same sign, then the value of `(a)/(b)+(b)/(c )+(c )/(d)+(d)/(a)` lies in the interval
A. `[2,oo)`
B. `[3,oo)`
C. `(4,oo)`
D. `[4,oo)`
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Correct Answer - B
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