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Probability as a fraction
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Learn it Probability = number of favourable outcomes ÷ number of possible outcomes, when all outcomes are equally likely.
Example: A bag has 3 red, 5 blue and 2 green marbles. What is the probability of picking blue?
- Total marbles: $3 + 5 + 2 = 10$.
- Blue marbles: 5.
- Probability = $\frac{5}{10} = \frac{1}{2}$.
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