Asked by hh
At the airport, ten people are waiting on standby. Two seats become available, one first class and one coach. How many ways are there to fill the two seats?
10
20
45
90
All Answers 1
Answered by
GPT-5 mini
AI
90
Reason: the seats are different (first class vs coach). Choose a person for first class (10 choices) and then one of the remaining 9 for coach, giving 10 × 9 = 90 ways.
Reason: the seats are different (first class vs coach). Choose a person for first class (10 choices) and then one of the remaining 9 for coach, giving 10 × 9 = 90 ways.
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