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camilita0623
Group Title
Twenty marbles are used to spell a word—9 blue ones, 5 red ones, 3 yellow ones and 3 green ones.?
Twenty marbles are used to spell a word—9 blue ones, 5 red ones, 3 yellow ones and 3 green ones.? If two marbles are drawn from the set of twenty marbles at random in succession and without replacement, what is the probability (as a reduced fraction) of choosing a marble other than green each time
 one year ago
 one year ago
camilita0623 Group Title
Twenty marbles are used to spell a word—9 blue ones, 5 red ones, 3 yellow ones and 3 green ones.? Twenty marbles are used to spell a word—9 blue ones, 5 red ones, 3 yellow ones and 3 green ones.? If two marbles are drawn from the set of twenty marbles at random in succession and without replacement, what is the probability (as a reduced fraction) of choosing a marble other than green each time
 one year ago
 one year ago

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kropot72 Group TitleBest ResponseYou've already chosen the best response.0
On the first draw there are 17 marbles that are not green. So the probability of choosing a marble other than green is 17/20. Having drawn a marble other than green on the first draw, on the second draw there are 16 marbles that are not green. So the probability of choosing a marble other than green is 16/9. The required probability is the product of the above 2 values of probability; \[P(no\ green\ after\ 2\ draws)=\frac{17}{20}\times \frac{16}{19}=you\ can\ calculate\]
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
that what I got but their is no answer like that. The answer choice is 1/3, 68/95, 1/11, 3/17
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
so I don't know what to do cause I got 16/19 but is not their
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.0
16/19 is not the correct result. When you reduce the fraction by dividing 16 by 4 and dividing 20 by 4 you can get the correct result as follows: \[\frac{17}{20}\times\frac{16}{19}=\frac{17\times4}{5\times19}=you\ can\ calculate\]
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
so is 68 over 95
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.0
Yes. That is the correct choice.
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
thank so much :)
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.0
You're welcome :)
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
is that the reduce franction?
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.0
Yes, it is. the original fraction is \[\frac{17\times16}{20\times19}=\frac{272}{380}\] 4 is a common factor to numerator and denominator. Therefore we can divide the numerator and the denominator by 4 giving:\[\frac{\frac{272}{4}}{\frac{380}{4}}=\frac{68}{95}\] In the above way the fraction has been reduced.
 one year ago

camilita0623 Group TitleBest ResponseYou've already chosen the best response.0
thank you so much, you save my life :)
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.0
You're welcome :)
 one year ago
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