Thursday, January 14, 2010

GMAT Question of the day.

How many three digit odd nos. can be formed from the digits : 2, 0, 3, 5?(repetition not allowed)

(a) 8
(b) 4
(c) 12
(d) 6

Simple way to solve the issue would be the place that is more restricted should be filled first.
Unit digit place can be filled in two ways (by 3 or 5 only) while the
hundred's place can be filled in three ways (by 2 or 3 or 5).
Therefore starting from the unit's place we can form the nos. in 2 x 2 x 2