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Vladimir79 [104]
3 years ago
11

Uppose a jar contains 12 red marbles and 18 blue marbles. if you reach in the jar and pull out 2 marbles at random without repla

cement, (a) find the probability of getting two red marbles:
Mathematics
2 answers:
garik1379 [7]3 years ago
8 0

\frac{12}{30}  \times  \frac{11}{29}  =  \frac{22}{145}
timurjin [86]3 years ago
8 0

\displaystyle |\Omega|=\binom{30}{2}=\dfrac{30!}{2!28!}=\dfrac{29\cdot30}{2}=435\\ |A|=\binom{12}{2}=\dfrac{12!}{2!10!}=\dfrac{11\cdot12}{2}=66\\\\ P(A)=\dfrac{66}{435}=\dfrac{22}{145}\approx15\%

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