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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?


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