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How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?

How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?
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How many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?

User Zardosht
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2 Answers

3 votes
60 ways because the easy way to solve this problem is identify the numbers being used and than multiply them by each other.
User Ryan Mcguinn
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7.6k points
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Slot method 20 options 3 slots First slot: 20 options Second slot: 19 options (one used up for 1st slot) Third slot: 18 (one less than last) Multiply them 20 times 19 times 18=6840 Answer is 6840 ways
User RiccardoC
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7.5k points
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