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प्रश्न
A die is thrown. Find the probability of getting
- a prime number
- a number greater than or equal to 3
उत्तर
Let S be the sample when a die is thrown.
Then S = {1, 2, 3, 4, 5, 6}
n(S) = 6
Let A be the event of getting a prime number.
A = {2, 3, 5}
n(A) = 3
Let B be the event of getting a number greater than or equal to 3.
B = {3, 4, 5, 6}
n(B) = 4
i. P(a prime number) = `("n"("A"))/("n"("S")) = 3/6 = 1/2`
ii. P(a number ≥ 3) = `("n"("B"))/("n"("S")) = 4/6 = 2/3`
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