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प्रश्न
A bag contains 10 red, 5 blue and 7 green balls. A ball is drawn at random. Find the probability of this ball being a red ball.
उत्तर
No. of red ball = 10
No. of blue ball = 5
No. of green balls = 7
If a ball is drawn out of 22 balls (5 blue + 7 green + 10 red), then the total number of outcomes are
n(S) = 22
Let E1 = Event of getting a red ball
∴ n(E1) = 10
∴ Required probability = `(n(E_1))/(n(S)) = 10/22 = 5/11`
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