SOLUTION: A computer password is to consist of four alphanumeric characters with no repeats. How many such passwords are there? How many are there if the letter O and the number 0 are exclud

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Question 873681: A computer password is to consist of four alphanumeric characters with no repeats. How many such passwords are there? How many are there if the letter O and the number 0 are excluded to avoid confusion?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
26 Letters, 10 Numbers
Choosing four alphanumeric characters with no repeats...How many are There?
N
0 26C4%29
1 %2826C3%29%2810C1%29
2 %2826C2%29%2810C2%29
3 %2826C1%29%2810C3%29
4 %2826C0%29%2810C4%29
25 Letters, 9 Numbers
0 25C4%29
1 %2825C3%29%289C1%29
2 %2825C2%29%289C2%29
3 %2825C1%29%289C3%29
4 %2825C0%29%289C4%29