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fatboy12
Group Title
Find the probability of randomly selecting three science books and four history books from a box containing five science books and six history books.
 one year ago
 one year ago
fatboy12 Group Title
Find the probability of randomly selecting three science books and four history books from a box containing five science books and six history books.
 one year ago
 one year ago

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wio Group TitleBest ResponseYou've already chosen the best response.2
@hba Why would we be adding in this case? It's not "three science books OR four history books"
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.2
No problem, I wasn't even sure that you were wrong, I was just confused.
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.2
My guess is \(\binom{5}{3} \times \binom{6}{4} \div \binom{11}{7} \) It's assuming they meant to say "choosing 7 books randomly". Because otherwise it could be 100% or even 0%.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
^ thats correct.
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
The answer would be 5/11 then ?
 one year ago

wio Group TitleBest ResponseYou've already chosen the best response.2
If I am correct then wolfram agrees: http://www.wolframalpha.com/input/?i=%285+choose+3%29+*+%286+choose+4%29++%2F+%2811+choose+7%29
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
hmm,I am really sorry about the mistake i made :/
 one year ago
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