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Using the digit from the set Q = (5, 6, 7, 8, 9), no digit [#permalink]
 05 Jul 2003, 08:20
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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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Manager
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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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1*4*3 = 12 Posted from my mobile device 
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SVP
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1st digit in - 1 way and remaining ones can be arranged in - 4P2 ways 1 * 4!/2! = 12 numbers
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