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中六排列與組合題目

發問:

5 persons are chosen at random from a group of 11 persons consisting of 4 men and 7 women. 3 of the women are sister. Find the number of ways that the 5 persons chosen. (a) without any restrictions, (b) consist of 5 women, (c) consist of 3 women and 2 men, (d) include the 3 sisters

最佳解答:

應該係咁計 (a) 5C11 = 462 (b) 5C7 = 21 (c) 3C7 x 2C4 = 210 (d) 3C3 x 2C8 = 28 唔明可以add我問 electrostaticwong@hotmail.com

其他解答:

(a)11C5=462 (b)7C5=21 (c)(7C3)(4C2)=210 (d)8C2=28A9A3995907B431A4
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