數學題(Combination)#6 20分
2011-12-13 10:53 pm
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2011-12-13 11:53 pm
✔ 最佳答案
5) He has to walk 11 blocks east and 8 blocks north to reach school, making up to 19!/(11! x 8!) = 75582 different routesHence no. of years he can walk before reroute = 75582/200 = 377.91
7) To randomly draw 2 ppl from 12, we have 12C2 = 66
8) 8C3 = 56
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