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American Express Business Travel uses a six letter record locator number

American Express Business Travel uses a six-letter record locator number (RLN) for each client's trip (e.g., KEZLFS).

(a) How many different RLNs can be created using capital letters (AZ)?

(b) What if they allow any mixture of capital letters (AZ) and digits (09)?

(c) What if they allow capital letters and digits but exclude the digits 0 and 1 and the letters O and I because they look too much alike?

(a) How many different RLNs can be created using capital letters (AZ)?

(b) What if they allow any mixture of capital letters (AZ) and digits (09)?

(c) What if they allow capital letters and digits but exclude the digits 0 and 1 and the letters O and I because they look too much alike?

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