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pooja123
Group Title
a bag contains 3white and 4red balls.two draws of one ball each are made without replacement.what is the probability that one is red and other is white
 one year ago
 one year ago
pooja123 Group Title
a bag contains 3white and 4red balls.two draws of one ball each are made without replacement.what is the probability that one is red and other is white
 one year ago
 one year ago

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RadEn Group TitleBest ResponseYou've already chosen the best response.1
Probability one is red of the first draw is 4/7 Probability one is white of the 2nd draw is 3/6 =1/2 multiply of both up, we get 4/7 * 1/2 = 4/14 = 2/7
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
does that make sense, @pooja123 ?
 one year ago

pooja123 Group TitleBest ResponseYou've already chosen the best response.0
the answer is 4/7.
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
4/7 is just for the probalility of one red only :) do u want draw 2 balls, right ?
 one year ago

pooja123 Group TitleBest ResponseYou've already chosen the best response.0
yes they used the formula like 2into4into3/7into 6
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
hmm. i dont understand that, actually the formula to get the probability of an event using : P(A) = number of event A / number all event
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.1
hmm well she is right the answer would be 4/7
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
why, can u explain more, nubber ?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.1
we found the probability 2/7 when first red and second white so P[RW] = 2/7 this is one case another possibility is that first is white and second is red P[WR] = 3/7 * 4/6 = 2/7 so total probability of this event = p[WR]+p[RW]
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
wait, is draw it one by one Or 2 balls direct ?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.1
hmm i think one by one...
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
hmmmm.. yeah, i see now. the question doesnt says the the first draw must red or white, thanks for your corrections @nubeer and sorry for @pooja123 :)
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.1
glad to help :)
 one year ago

pooja123 Group TitleBest ResponseYou've already chosen the best response.0
thank u guys
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
im not becareful with this question :)
 one year ago

1411akshay Group TitleBest ResponseYou've already chosen the best response.0
can u see my isosceles triangle solution for one sec
 one year ago
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