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SLot method

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sfbay
 Post subject: SLot method
 Post Posted: Wed Mar 02, 2011 4:59 pm 
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how many 4 digit codes possible using digits 0-9.
restriction first number can not be 0.

is it as simple as: 9 x 9 x 8 x 7
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jnelson0612
 Post subject: Re: SLot method
 Post Posted: Thu Mar 03, 2011 10:17 am 
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ManhattanGMAT Staff


Posts: 1857
munnynarang wrote:
how many 4 digit codes possible using digits 0-9.
restriction first number can not be 0.

is it as simple as: 9 x 9 x 8 x 7


If our only restriction is that the first number cannot be 0, we have:

9 possibilities for the first number (1-9)
10 possibilities for the second, third, and fourth number (0-9)

So that is 9 * 10 * 10 * 10 = 9,000

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Jamie Nelson
ManhattanGMAT Instructor
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sfbay
 Post subject: Re: SLot method
 Post Posted: Thu Mar 03, 2011 8:41 pm 
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additional restriction is using digit only once
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jnelson0612
 Post subject: Re: SLot method
 Post Posted: Sat Mar 05, 2011 6:58 am 
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ManhattanGMAT Staff


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munnynarang wrote:
additional restriction is using digit only once


In that case I agree with your original equation.

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Jamie Nelson
ManhattanGMAT Instructor
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