Amy S.

asked • 01/26/18

Probability

A bag contains 15 identical marbles. There are 7 red, 3 blue and 5 yellow marbles. A marble is picked out at random and not replaced. A second marble is then picked out at random and not replaced. 
 
a) find the probability that
(i) both marbles are red 
(ii) one marble is red and the other is not red 
 
b) a third marble is now picked out at random. Calculate the probability that two marbles are red and one is not red. 

2 Answers By Expert Tutors

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Amy S.

Wow thanks for the detailed explanation. It did take me quite a while to get it. :)
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01/27/18

Arthur D.

tutor
You're welcome, Amy.
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01/27/18

Naomi S. answered • 01/26/18

Tutor
New to Wyzant

10+ years of experience and very patient with students

Amy S.

There's a part (b). Could you help me with that as well? 
 
b) a third marble is now picked out at random. Calculate the probability that two marbles are red and one is not red.
 
Thanks so much!
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01/26/18

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