Having trouble with permutations and combinations

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Clifford Cook

18. april 2017 20:15
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Shortly after being put into service, some buses manufactured by a certain company have developed cracks on the underside of the main frame. Suppose a particular city has 25 of these buses, and cracks have actually appeared in 8 of them.

a) In how many ways can a sample of 5 buses contain exactly 4 with variable cracks? The book is showing me the answer of 1190. I am lost on how they are concluding that.. If someone could help please it would be greatly appreciated.

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Clifford Cook

18. april 2017 21:03
1

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Figure it out it is a tricky question and I hope my answer helps someone out in the future. The solution is 17C1 * 8C4 You have 17 buses that do not have a crack going into 1 spot and you have 8 buses that are cracked going into 4 spots you have to do the math separate and then multiply.
Domi Irocks-thatThing Versaix

22. september 2017 23:15
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Perfect!! Thank you @Clifford Cook!!

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Having trouble with permutations and combinations

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