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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1
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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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2
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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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3
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A box contains two white balls, three black balls and four red balls. Balls of the same colour are distinct. The number of ways in which three balls can be drawn from the box if atleast one black ball is to be included in the draw, is
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4
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In a single throw with four dice,the probability of throwing seven is
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5
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In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?
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6
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A five-letter word is to be formed from a group of 5 vowels and 4 consonants, using at least one vowel and at least one consonant. In how many ways the word having a greater number of consonants than vowels can be formed?
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7
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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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8
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How many rectangles can be formed out of a chess board ?
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9
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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10
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A coin is tossed 5 times. What is the probability that head appears an odd number of times?
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