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P&C

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Re: P&C

by rahulg83 » Fri Jul 10, 2009 1:40 pm
adityanarula wrote:How many 3 digit numbers are possible using the digits 0,1,4,5,7 and 9
[spoiler]
OA: 180
IMO: 100[/spoiler]


Consider number as ABC
For A, you have 5 choices 1,4,5,7 and 9
For B and C each, you have 6 choices (0,1,4,5,7 and 9)

Total 3 digit numbers = 5*6*6 = 180
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by adityanarula » Fri Jul 10, 2009 4:01 pm
I thought we could not repeat the digits!
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by sreak1089 » Fri Jul 10, 2009 9:12 pm
but its not given in the question that repetition should not occur right?
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