Permutation & Combination · Question 3 · Easy
A class has 6 boys and 4 girls. In how many ways can a class monitor and a deputy monitor (two different people) be chosen?
- 20
- 45
- 90
- 100
Answer and explanation
Answer: C. 90
Explanation: Two distinct posts from 10 students: 10P2 = 10 × 9 = 90.
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