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?
24
12
36
48
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1
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Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart, is
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2
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12 person are seated at a round table. Number of ways of selecting 2 persons not adjacent to each other is
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3
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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4
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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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5
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It is required to seat 5 boys and 4 girls in a row so that the girls occupy the even places. How many such arrangements are possible?
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6
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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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7
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One red flower, three white flowers, and two blue flowers are arranged in a line such that
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8
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How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), when the digit at the unit’s place must be greater than that in the ten’s place?
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9
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If (n + 2)! = 2550 (n!); find ’n’
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10
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What is the probability of getting at least one six in a single throw of three unbiased dice?s
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