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MATH / Our physics club has 20 members, among which we have 3 officers: President, Vice President, and Treasurer. However, one member, Alex, hates another member, Bob. How many ways can w…

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problem

Our physics club has 2020 members, among which we have 3 officers: President, Vice President, and Treasurer. However, one member, Alex, hates another member, Bob. How many ways can we fill the offices if Alex refuses to serve as an officer if Bob is also an officer? (No person is allowed to hold more than one office.)
Plain-text mathematical notation (without MathML)
Our physics club has 20 members, among which we have 3 officers: President, Vice President, and Treasurer.  However, one member, Alex, hates another member, Bob.  How many ways can we fill the offices if Alex refuses to serve as an officer if Bob is also an officer? (No person is allowed to hold more than one office.)
Original LaTeX notation
Our physics club has $20$ members, among which we have 3 officers: President, Vice President, and Treasurer.  However, one member, Alex, hates another member, Bob.  How many ways can we fill the offices if Alex refuses to serve as an officer if Bob is also an officer? (No person is allowed to hold more than one office.)

level

Level 4

type

Counting & Probability

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