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Source: — Data Sufficiency |
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by tmmyc » Thu Mar 20, 2008 3:52 pm
1) First, break 728 into its prime factors.

728 = 2 * 2 * 2 * 7 * 13

Then, make it equal to the 'pst' formula.

p^3*s*t = 2*2*2*7*13

Therefore,
p = 2
s*t = 7*13

and
p^3=8
(s*t)^3 = s^3*t^3 = 7^3*13^3

Sufficient, since we can find p^3s^3t^3.


2) t=13 tells us nothing about p ands, therefore this is insufficient.

Answer is A.
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by HarvardDreamin » Fri Mar 21, 2008 8:52 am
Many thanks
ON MY WAY TO HBS......
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by cjiang16 » Mon Apr 07, 2008 11:23 pm
thanks. :lol:
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