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How many positive 3-digit integers contain both even and odd digits?

 Jul 14, 2020
 #1
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My computer says there are 450 such numbers, which appears accurate since you have: 9 digits for the hundredth place x 10 digits for the tenth's place x 5 digits alternating beween 5 even digits and 5 odd digits in ones' place.

 Jul 14, 2020

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