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I coach a soccer team with 15 members. i want to choose a starting lineup consisting of 11 players, two of whom will represent the team in the captains meeting at the beginning of the game. in how many ways can i choose my starting lineup, including designating the two captains?

Respuesta :

konrad509

[tex]{_{15}C_{11}}\cdot {_{11}C_2}=\dfrac{15!}{11!4!}\cdot\dfrac{11!}{2!9!}=\dfrac{12\cdot13\cdot14\cdot15}{2\cdot3\cdot4}\cdot\dfrac{10\cdot11}{2}=75,075[/tex]

Answer: There are 715 ways to choose his starting lineup which includes designating the two captions.

Step-by-step explanation:

Since we have given that

Number of members = 15

Number of players = 11

Number of captions must be included = 2

So, Number of remaining members = 15-2 = 13

Number of remaining players = 11 - 2 = 9

So, Number of ways to choose starting line up is given by

[tex]^{13}C_9\\\\=715[/tex]

Hence, there are 715 ways to choose his starting lineup which includes designating the two captions.

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