P&C

rahulg83: Legendary Member; Posts: 575; Joined: Tue Nov 04, 2008 2:58 am; Location: India; Thanked: 18 times; Followed by:4 members; GMAT Score:710

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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adityanarula: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Thu May 21, 2009 8:52 am; Thanked: 3 times

by adityanarula » Fri Jul 10, 2009 4:01 pm

I thought we could not repeat the digits!

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sreak1089: Master | Next Rank: 500 Posts; Posts: 379; Joined: Wed Jun 03, 2009 3:05 am; Thanked: 19 times; Followed by:1 members; GMAT Score:690

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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