The probability of selecting a blue marble at random from a jar that contains
Probability (10)The probability of selecting a blue marble at random from a jar that contains only blue, black and green marbles is $\frac{1}{5}$. The probability of selecting a black marble at random from the same jar is $\frac{1}{4}$. If the jar contains 11 green marbles, find the total number of marbles in the jar.
Answer
- Exam Year: 2019
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