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1. Consider passcodes that can only contain any letters A, B, C, D, and E and...

1. Consider passcodes that can only contain any letters A, B, C, D, and E and numbers 0, 1, 2, 3, 4. A passcode contains 5 items, and repitition is allowed

(a) [1 point] How many passcodes exist where items can be repeated?

(b) [1 point] How many passcodes exit where items cannot be repeated?

(c) [2 points] How many passcodes contain at least a 5 or an A?

Math   Statistics-And-Probability   
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