[quote=almas]
Quote:
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Originally Posted by TwinnSplitter
Thanks for these great resources.
My answers to that document are as follows, anybody else who did them let me know what you got:
B
C
A
C
A bag of 10 marbles contains 3 red marbles and 7 blue marbles. If two marbles are selected at random, what is the probability that at least one marble is blue?
D (the way I did this took kind of long, if somebody else could let me know how they did it I'd appreciate it)
(7c1*3c1+7c2)10c2= 42/45=14/15
answer D
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= 1 - Probability that both marbles are red
= 1 - (3/10)*(2/9)
= 1 - 6/90
= 1 - 1/15
= 14/15