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Source: — Data Sufficiency |
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by santa_dem » Wed Aug 13, 2008 2:15 am
(a/b)*(c/d)=(a/d)*(c/b)

so we are comparing (a/d)*(c/b) to c/b

(a/d)*(c/b)>c/b

if all the terms are positive, x*a>a if x>1, so we need to know if (a/d)>1.

1. does not say anything about a/d

2. a>d, both terms positive, this means a/d>1, which solves the problem.

Therefore, answer - B. only second statement.
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by sudhir3127 » Wed Aug 13, 2008 2:18 am
i think if u solve the equation u will get it

a/b*c/d > c/b

take c/b common on left hand side
c/b( a/d) > c/b

cancel c/b on both sides
a/d >1

hence a> d.

thus B.

hope it helps..
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