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Find the number of five-digit positive integers such that the digits are alternately odd and even (either odd-even-odd-even-odd or even-odd-even-odd-even)

 Dec 1, 2019
 #1
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Find the number of five-digit positive integers such that the digits are alternately odd and even (either odd-even-odd-even-odd or even-odd-even-odd-even)

 

o e,o,e,o      5*5*5*5*5

e,o,e,o,e       4*5*5*5*5

 

now add them

 Dec 1, 2019

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