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Question 153547: How many 9 digit numbers can be made from the set 1-9. No repeat digits so that all even digits remain adjacent?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! How many 9 digit numbers can be made from the set 1-9. No repeat digits so that all even digits remain adjacent?
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The adjacent even digits can be arranged in 4! ways.
Considering the 4-even as one clump, you have 5 odd and a clump to arrange.
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Total # of arrangements is 4! * 6! = 17280
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Cheers,
Stan H.
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