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How many positive four-digit even numbers can be written without using any of the digits 0, 1, 2, 3 or 4?

 Jul 13, 2020
 #1
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0

250. oops. I know it now.

 Jul 13, 2020
 #2
avatar+161 
0

Huh? Can I have a solution. Thanks.

tigernathan  Jul 13, 2020
 #3
avatar+26006 
+1

choices  5 6 7 8 9

position 1    5 choices

position 2    5 choices

position 3    5 choices

position 4    5 choices

 

5 x 5 x 5 x 5 = 625 possible numbers      EVEN numbers end in 6 or 8  ( 2 out of 5 choices)

                        2/5 x 625 = 250 evens

 Jul 13, 2020

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