Question 454221: How many 4-digit numbers can you build with a 3, a 4, a 6, and an 8 that are over 6000?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! How many 4-digit numbers can you build with a 3, a 4, a 6, and an 8 that are over 6000?
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The thousands digit would have to be 6 or 8, i.e. 2 ways
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Each of the remaining 3 digits can be selected
in 4 ways, if repetition is allowed.
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That would give you 2*4^3 = 2*64 = 128 numbers
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If repetition is not allowed you get 2*3*2*1 = 12 numbers.
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Cheers,
Stan H.
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