Question 201534: How many three digit numbers start with a prime digit, have an even digit in the
middle, and an odd digit at the end?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! How many three digit numbers start with a prime digit, have an even digit in the
middle, and an odd digit at the end?
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The 1st digit will be 2, 3, 5 or 7, one of those 4.
The 2nd and 3rd will be 1 of 5, so it's
4*5*5 = 100
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PS 2 is a prime number, the only even prime number. Don't accept that it isn't, demand an explanation. 1 is not considered a prime number, just by convention, meaning we all agree on it.
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