SOLUTION: How many four digit numbers begin with odd digit and end with even digit.

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Question 358997: How many four digit numbers begin with odd digit and end with even digit.
Answer by robertb(5830) About Me  (Show Source):
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There are 5 ways of filling the thousands place {1,3,5,7,9}.
There are 10 ways of filling the hundreds place {0,1,2,3,4,5,6,7,8,9}.
There are 10 ways of filling the tens place {0,1,2,3,4,5,6,7,8,9}.
There are 5 ways of filling the hundreds place {0,2,4,6,8}.
Therefore there are 5%2A10%2A10%2A5+=+2500four digit numbers beginning with anodd digit and ending with an even digit.