A manager must award first and second prizes to two of 6 staff. In how many ways can this be done?
Answer and explanation
Correct answer: B. 30
- Step 1: Order matters, so use permutations: nPr = n!/(n - r)!. Step 2. 6P2 = 30. Answer: 30. Why not the others: 15: That ignores the order. 36: That allows repeats. 12: That multiplies n by r.
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