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Using the digit from the set Q = (5, 6, 7, 8, 9), no digit

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Using the digit from the set Q = (5, 6, 7, 8, 9), no digit [#permalink] New post 05 Jul 2003, 07:20
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Using the digit from the set Q = (5, 6, 7, 8, 9), no digit being used
more than once, how many 3-digit numbers smaller than 600 can be made?
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 [#permalink] New post 06 Jul 2003, 04:48
First Digit needs to be 5 only.

Second digit is one among 6,7,8,9 = 4 ways

Third digit is one among the 3 numbers left = 3 ways

Total 3-digit numbers we can make = 1X4X3 = 12
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Re: PS: DIGITS [#permalink] New post 15 Apr 2011, 14:28
1*4*3 = 12

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Re: PS: DIGITS [#permalink] New post 15 Apr 2011, 19:53
1st digit in - 1 way and remaining ones can be arranged in - 4P2 ways

1 * 4!/2! = 12 numbers
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Re: PS: DIGITS   [#permalink] 15 Apr 2011, 19:53
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Using the digit from the set Q = (5, 6, 7, 8, 9), no digit

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