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The probability that out of 10 person, all born in June, at least two have the same birthday is
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The probability that out of 10 person, all born...
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Nov 15, 2021
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JackTerrance
The probability that out of 10 person, all born in June, at least two have the same birthday is A. .30C10 (30)10 B. .30C10 30! C. 3010-.30C10 (30)10 D. none of these Select the correct answer from above options
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Nov 15, 2021
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JackTerrance
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Correct Answer - C Since each person can have any one of the thirty days of June month as his (her) birthday. Therefore, Number of ways in which 10 persons can have birthdays in the month of June = 30 × 30 × 30 × . . × 30 ( 10 times ) = 30 10 = ∴ ∴ Required probability =1-Probability that no two persons have the same birth day = 1 − . 30 C 10 30 10 = 30 10 − . 30 C 10 30 10 =
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