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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In how many different ways can the letters of the word 'DETAIL' be arranged in such a way that the vowels occupy only the odd positions?
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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
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4
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A polygon has 44 diagonals. What is the number of its sides?
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5
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How many rectangles can be formed out of a chess board ?
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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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Find the probability that a leap year selected at random will contain 53 Sundays
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8
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What is the sum of all 4 digit numbers that can be formed by the digits 1, 2, 3, 4 each exactly once
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9
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Ten participants are participating in a competition. In how many ways can the first three prizes be won?
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10
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If C(n, 7) = C(n, 5), find n
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