SOLUTION: how many 4 digit odd numbers are possible if the left digit cannot be zero

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Question 523934: how many 4 digit odd numbers are possible if the left digit cannot be zero
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
Since it cannot equal 0, there are 9 possibilities for the 1st digit.
The 2nd and 3rd digits can be any number from 0-9 so there are 10 possibilities for them.
For the number to be odd, there are 5 possibilites for the 4th digit: 1,3,5,7,9
So the total probability is 9*10*10*5 = 4500