C maybe ?
(1) the decimal will be in the form ( 1/(5^n)*q) - thus, the denominator is a multiple of five. But we don't know anything about q. Insufficient.
(2) The denominator is a multiple of 3. But we don't have anything about p. BUT:
Read in MGMAT FDPs that "when you express terminating decimals as fractions in lowest levels. they only have 2's and/or 5's as a prime factors in their denominators.
So the denominator cannot be expressed as only 2's and 5's.
Thus, 2 must be sufficient. B. ??
What is the OA.
P.s. i edited my post, the first one was definitely wrong as i chose A.
Last edited by
NikolayZ on Sat Oct 10, 2009 10:51 am, edited 1 time in total.