numper property

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numper property

by tanviet » Wed Apr 15, 2009 3:50 am
Howmany 4-digit positive intergers are there in which all 4 digit are even

625
600
500
400
256

pls help with this

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by lav » Wed Apr 15, 2009 4:07 am
My ans C : 500
Wats the OA ?

there are 5 digits 0,2,4,6,8

for the 'thousands' place we have 4 possible choice 2,4,6,8 ( cant take 0 else it will be a 3 digit no )
for 'hundreds' place have 5 possible choices can pick any of 5 , same goes for tens place and units place

so ans is 4x5x5x5 = 500
Kid in Verbal :(

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by tanviet » Wed Apr 15, 2009 11:57 pm
thank you, OA is C