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?
2880
2148
3280
3680
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1
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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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10
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If C(n, 7) = C(n, 5), find n
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2
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A, B, C, D and E sit on five chairs all of which are facing north. C will sit only on the leftmost chair and B will not sit anywhere to the left of A. In how many ways they can be seated?
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3
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If a team of 4 persons is to be selected from 8 males and 8 females, then in how many ways can the selections be made to include at least 1 female
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4
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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5
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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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6
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A box contains 5 green, 4 yellow and 3 white marbles. three marbles are drawn at random. What is the probability that all they are not of the same colour?
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7
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Seven different objects must be divided among three people. In how many ways can this be done if one or two of them must get no objects?
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8
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In a single throw with four dice,the probability of throwing seven is
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9
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Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?
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