If ,
,
are probabilities of three mutually exclusive events, then
None Of These
Answer :1/2
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1
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In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?
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2
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In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?
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3
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There are 20 people among whom two are sisters. Find the number of ways in which we can arrange them around a circle so that there is exactly one person between the two sisters.
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4
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How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated
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5
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There are 8 orators A, B, C, D, E, F, G, and H. In how many ways can the arrangements be made so that A always comes before B and B always comes before C.
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6
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Ten participants are participating in a competition. In how many ways can the first three prizes be won?
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7
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How many 5 digit even numbers with distinct digits can be formed using the digits 1, 2, 5, 5, 4?
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8
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A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?
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9
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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10
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If (n + 2)! = 2550 (n!); find ’n’
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