If A and B are two independent events with P(A) = 3/5 and P(B) = 4/9 , then P(A' ∩ B' ) equals
4/15
8/45
1/3
2/9
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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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2
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A polygon has 44 diagonals. What is the number of its sides?
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3
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There are 8 orators A, B, C, D, E, F, G, and H. In how many ways can the arrangements be made so that A always comes before B and B always comes before C.
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4
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In how many ways can the letters of the word 'LEADER' be arranged?
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5
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6
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7
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8
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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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9
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10
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