In how many ways can 10 people line up at a ticket window of a railway station?
36,28,800
34,82,800
33,44,800
33,28,800
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1
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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 |
10
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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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2
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If ,, are probabilities of three mutually exclusive events, then
SolutionAnswer :1/2 |
3
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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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4
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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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5
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In a single throw with four dice,the probability of throwing seven is
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6
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In how many different ways can the letters of the word 'CORPORATION' be arranged so that the vowels always come together?
Solution |
7
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The students in a class are seated, according to their marks in the previous examination. Once, it so happens that four of the students got equal marks and therefore the same rank. To decide their seating arrangement, the teacher wants to write down all possible arrangements one in each of separate bits of paper in order to choose one of these by lots. How many bits of paper are required?
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8
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In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?
Solution |
9
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From a group of 7 men and 6 women, five persons are to be selected to form a committee so that at least three men are in the committee. In how many ways can it be done?
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