A. To use an automated teller machine at a certain bank, you must enter a 4-digit code, using the digits 1–9. How many...

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A. To use an automated teller machine at a certain bank, you must enter a 4-digit code, using the digits 1–9. How many...

A. To use an automated teller machine at a certain bank, you must enter a 4-digit code, using the digits 1–9. How many 4-digit codes are possible if repetition of digits is permitted?

B. If a club consists of 13 members, how many different arrangements of president, vice-president, and secretary are possible?

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