Asked Nov 5, 2019

How many four-digit even numbers are possible if the leftmost digit cannot be zero? Repetition is allowed.


Expert Answer

Step 1

The question is to find how many 4 digits even numbers are possible if the left most digit cannot be zero.

Note that if the left most digit is zero then the number will become a 3-digit number. So, it is automatically true that the left most digit cannot be zero for 4 digits numbers.

We have { 0,1,2,3,4,5,6,7,8,9} total ten numbers.

Since the left most digit ca...

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