PS - Which is greater

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PS - Which is greater

by f2001290 » Fri Jun 22, 2007 6:05 am
Please help
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by givemeanid » Fri Jun 22, 2007 7:17 am
450y = n^3
450 = 2 x 3 x 3 x 5 x 5
Since y and n are positive integers, y must atleast have 2 x 2 x 3 x 5 to complete the cubes.


So, only (I) must be an integer.


By picking numbers, let y = 60, n^3 = 450 * 60 = 27000. n = 30

(I) = 1
(II) = 2/3
(III) = 2/5

So, only (I) is an integer.

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by 800GMAT » Sun Jun 24, 2007 4:51 pm
Agree with (1) only