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mynameisjanelle
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In how many ways can a gymnastics team of 4 be chosen from 9 gymnasts?
 2 years ago
 2 years ago
mynameisjanelle Group Title
In how many ways can a gymnastics team of 4 be chosen from 9 gymnasts?
 2 years ago
 2 years ago

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mynameisjanelle Group TitleBest ResponseYou've already chosen the best response.0
dont get this one, could someone show me the steps?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
"chosen" so you use combinations
 2 years ago

apple_pi Group TitleBest ResponseYou've already chosen the best response.1
from 9 choose 4. 9C4 = ...
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
arent you missing something?
 2 years ago

mynameisjanelle Group TitleBest ResponseYou've already chosen the best response.0
362880?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
that's 9!
 2 years ago

apple_pi Group TitleBest ResponseYou've already chosen the best response.1
don't forget to divide by all the same combinations (nr)!
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
\[9C4 \implies \frac{9!}{4!(94)!}\]
 2 years ago

apple_pi Group TitleBest ResponseYou've already chosen the best response.1
dividing by (nr)! is what separates the combination formula from the permutation, because you are not counting all the different arrangements
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
isnt dividing r! what separates it?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
\[nCr = \frac{n!}{r!(nr)!}\] \[nPr = \frac{n!}{(nr)!}\]
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
dividing by r! is just the difference i see =))
 2 years ago

mynameisjanelle Group TitleBest ResponseYou've already chosen the best response.0
126!!
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
i hope those ! arent factorials :p haha
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.2
anyway yeah. 9C4 = 126
 2 years ago

mynameisjanelle Group TitleBest ResponseYou've already chosen the best response.0
ya:P
 2 years ago

apple_pi Group TitleBest ResponseYou've already chosen the best response.1
Ooops, I meant r! not (nr)! for all the above posts. Sorry :o
 2 years ago
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