+0  
 
0
41
1
avatar

How many 4-digit numbers have the second digit even and the fourth digit even? (Here, digits are read from the left, so the first digit is the leftmost digit, and so on.)

 Aug 26, 2021
 #1
avatar
0

1 2 3 0

 

You have 9 choices for the first number==9

You have 5 choices for the 2nd number ==5

You have 10 choices for the 3rd number==10

You have 5 choices for the 4th number ==5

 

Therefore, there are: 9  x  5  x  10  x  5 ==2,250 such numbers.

 Aug 26, 2021

22 Online Users

avatar