In a lottery, there are 10 prizes and 20 blanks. A ticket is chosen at random. What is the probability of getting a prize?

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Solution

Total number of tickets $= 10 + 20 = 30$

Number of prize tickets = 10

∴ $P_{(getting a prize)} = \frac{10}{30} = \frac{1}{3}$

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In a lottery, there are 10 prizes and 20 blanks. A ticket is chosen at random. What is the probability of getting a prize?

Total number of tickets =10+20=30Number of prize tickets = 10∴​ Pgetting a prize=1030=13

Total number of tickets $= 10 + 20 = 30$

Number of prize tickets = 10

∴ $P_{(getting a prize)} = \frac{10}{30} = \frac{1}{3}$