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A guy own 10 white toy bulls, 14 yellow toy bulls, and 8 black toy bulls.

If he is blindfolded, and puts 11 bulls in one bag, and 11 in another bag, what is the chance of a yellow bull being in bag 1, and the chance of a black bull being in both bag 1 and 2?

 

They're are 10 leftover bulls. What is the chance of a white bull being in the group of leftover bulls?

 Nov 27, 2018
edited by DaP1ckle  Nov 27, 2018
 #1
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P[at least 1 yellow bull in bag 1]=1P[no yellow bulls in bag 1]=110w=3(10w)(811w)(3211)=206719206770

 

 

I'll post #2 when I figure it out

 

 

P[white bull in group of leftovers]=1P[all white bulls in bag 1 or bag 2]=(think of bag 1 and bag 2 as one big bag here)112y=4 (14y)(812y)(3222)=24563692481240

 Nov 30, 2018
 #2
avatar+6251 
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P[at least 1 black bull in each bag]=1P[no black bull in bag 1 or no black bull in bag 2 or both]=1P[no black bull in bag 1]P[no black bull in bag 2]+P[no black bull in either bag]

 

As the problem is symmetric w/respect to the bagsP[no black bull in bag 1]=P[no black bull in bag 2]P[no black bull in bag 1]=10w=0 (10w)(1411w)(3211)=2261116870

 

P[no black bull in either bag]=2w=0 (10w)(142w)(3210)=1233740

 

P[at least 1 black bull in both bags]=122261116870+1233740=224697233740

.
 Dec 1, 2018

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