chi kio asked in 科學及數學數學 · 1 decade ago

combination

In how many ways may a group of 5 men be chosen from a squad of 9? In how many of these will two particular men appear?

first ques has been solved. i need the second one. thx

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    As two particular men should appear in the 5-men group,

    That equals to you have only 3 free seat that chosen from the remaining 7 people, so that is 7C3.

  • 匿名
    Lv 6
    1 decade ago

    1st Q: 9C5 = 126

    2nd Q: 9C5 - 7C3 = 126 - 35 = 91

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