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jmc

counting and probability junior

Problem

Our club has 20 members, 10 boys and 10 girls. In how many ways can we choose a president and a vice-president if we have no restrictions other than the same person can't hold both offices?
Solution
The president can be any one of the 20 members, and the vice-president can be any one of the 19 remaining members. The answer is .
Final answer
380