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  1. If the fraction a/b is positive, then which of the following must be true ?
    1. a > 0
    2. b > 0
    3. ab > 0
    4. a + b > 0
Correct Option: C

If the fraction a/b is positive,
then a > 0 ..............(i)
and b > 0 ..............(ii)
Multiply (i) and (ii)
So ab > 0 must be true.


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