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Digits

by GmatKiss » Mon Aug 15, 2011 12:00 am
How many even number of 4 digits can be formed with the figures 3,4,7,8 if repetitions are allowed?

64
128
12
256
255
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by pgkkumar » Mon Aug 15, 2011 5:57 am
The digit in the thousands place can be selected in 4 ways.
Digit in hundreds place in 4 ways.
Digit in tens, 4 ways and the unit's in 2 ways.

So the total # of even digits is 4*4*4*2 = 128
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by GMATSUCKER » Mon Aug 15, 2011 6:00 am
Is this a GMAT type question ?
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by gmatboost » Mon Aug 15, 2011 9:44 am
Yes, I think so.
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