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中六~!~!

發問:

14) there are 10 articles, 2 of which are alike and the rest are all different. in how many ways can a selection of 5 articles be made ? ANSWER=182

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最佳解答:

5 articles 中含兩遍 alike articles, 8C3 = 56 5 articles 中含其中一遍 alike articles, 8C4 = 70 5 articles 中無含 alike articles, 8C5 = 56 56 + 70 + 56 = 182

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