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Question

If numbers a, b, c, d are positive and if ab > cd, then :

A
ad < bc
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B
ad > bc
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C
ad = bc
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D
adbc
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Solution

The correct option is B ad > bc
Comparison of ratios ab, cd can be done using following rules :
i) If ab > cd, then ad > bc.
ii) If ab < cd, then ad < bc.
iii) If ab = cd, then ad = bc.

So, as it is given ab > cd, the answer is ad > bc.

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