Probability

Just need help with a few homework questions.

1. Suppose your debit card PIN must be four digits (0-9). IF you PIN must contain the 5 digtis 1 (in some order, and not nexessarily as consecutive digits) and you are not allowed to repeat digits, how many possible chocise can you have ?

2. Suppose your email password must be exactly 8 characters long.

2a. if the password must be 6 uppercase letter (a-z) followed bu a single digit, how many choices are possible

2b. if the password must be 7 uppercase followed by a single digit, how many are possible?

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