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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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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2
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If ^{18}C_{r }= ^{18}C_{r+2 }; find ^{r}C_{5}.
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3
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Find the probability that a leap year selected at random will contain 53 Sundays
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4
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The number of triangles that can be formed by choosing the vertices from a set of 12 points, seven of which lie on the same straight line, is
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5
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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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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?
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7
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A speaks truth in 75% cases and B in 80% of the cases. In what percentage of the cases are they likely to contradict each other, narrating the same incident?
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8
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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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9
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If A and B are two independent events with P(A) = 3/5 and P(B) = 4/9 , then P(A' ∩ B' ) equals
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10
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In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
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