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How many even three-digit positive integers have the property that exactly two of the integer's digits are even?

 Nov 20, 2020

Best Answer 

 #1
avatar+146 
+1

Alright, here we go. Lets count out how many there are for odd starting numbers, and then even starting numbers. 
For odd: The next two have to be even. So 5 possibilities per row, 5 rows, 25 possibilities for 1,3,5,7,9. So 125 for odd
For even its a bit more complicated. Zero doesn't count because that would be 2 digits. So we start with 2. 50 possibilities for that one. x 4. 200. Answers 325. I know I'm not clear but there's the answer. 






 

 

325. For all you people that don't want to read. 

 Nov 20, 2020
 #1
avatar+146 
+1
Best Answer

Alright, here we go. Lets count out how many there are for odd starting numbers, and then even starting numbers. 
For odd: The next two have to be even. So 5 possibilities per row, 5 rows, 25 possibilities for 1,3,5,7,9. So 125 for odd
For even its a bit more complicated. Zero doesn't count because that would be 2 digits. So we start with 2. 50 possibilities for that one. x 4. 200. Answers 325. I know I'm not clear but there's the answer. 






 

 

325. For all you people that don't want to read. 

Imnotamaster Nov 20, 2020
 #2
avatar+116126 
0

Good job, imnotamaster   !!!!

 

cool cool cool

CPhill  Nov 20, 2020

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