SOLUTION: How many different three-digit numbers can be formed from the digits 0 through 9 if the first digit must be odd and the last digit must be even?
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Question 204217: How many different three-digit numbers can be formed from the digits 0 through 9 if the first digit must be odd and the last digit must be even?
I have been staring at this problem all night and I still have no idea what it is asking... This question is so weird.. Please help... Answer by solver91311(24713) (Show Source):
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Of the digits 0 through 9, 5 of them are odd, so there are 5 ways to select the first digit. There are no restrictions on the second digit so it can be any one of the 10 digits 0 through 9. Of the digits 0 through 9, 5 of them are even (0 is an even number by definition), so there are 5 ways to select the third digit. In all:
