possible 5 character passwords

Question

the digits 0 to 9 where the first digit must be even and last digit must be odd, and where digits can be repeated? 

Answer 1

Place the first digit and you have 5 choices. Then place the last digit and you have 5 choices. For the rest of the spots, since you can repeat digits, you have ten choices each. Now just multiply... 5x10x10x10x5 to get your answer.

 

Dan