If ,, are probabilities of three mutually exclusive events, then
None Of These
Answer :1/2
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1
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If four dice are thrown together, then what is the probability that the sum of the numbers appearing on them is 25 ?
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2
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How many natural numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
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3
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What is the sum of all 4 digit numbers that can be formed by the digits 1, 2, 3, 4 each exactly once
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4
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If (n + 2)! = 2550 (n!); find ’n’
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5
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If A, B and C are mutually exclusive and exhaustive events of a random experiment such that P(B)=3/2P(A) and P(C)=1/2P(B), then P(A∪C)=
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6
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If 18Cr = 18Cr+2 ; find rC5.
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7
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In how many ways can the letters of the word 'LEADER' be arranged?
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8
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A, B, C, and D are four points, any three of which are non-collinear. Then, the number of ways to construct three lines each joining a pair of points so that the lines do not form a triangle is
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9
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If C(n, 7) = C(n, 5), find n
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10
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A person tosses an unbiased coin. When head turns up, he gets Rs.8 and tail turns up he loses Rs.4. If 3 coins are tossed, what is probability that he gets a profit of Rs.12?
SolutionPerson will get profit of Rs 12 only when there is 2H (Head) and 1T (Tail) H + H + T = 12 8 + 8 + (-4) = 12 Total outcome of 2 head and 1 tail = 23 = 8 i.e (T, H, TH, HT, HH, HHT, HTH, THH) Total event with 2H and 1 T is 3 therfore probability = 3/8 |
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