alleryFor rational numbers a/b and c/d with strictly positive denominators, a/b < c/d holds precisely when:
Aa + d < b + c
Ba - d < b - c
Ca x d < b x c
Da x b < c x d
Answer & Solution
Correct answer: C. a x d < b x c
Multiplying both sides by the positive product b times d yields the cross product condition.
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