Six boys and 4 girls are to be seated in two separate rows with five chairs each, such that two particular girls are always together and all the girls are not in the same row. In how many ways can they be seated?
15 * 7!
20 * 8!
18 * 7!
(16 * 8! – 4! * 6!)
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1
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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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If C(n, 7) = C(n, 5), find n
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3
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One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is not a face card (Jack, Queen and King only)?
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4
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In how many ways the letters of the word “UNDERDOG” can be arranged such that the first and last letters are same and no two vowels are together?
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5
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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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6
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In a simultaneous throw of two dice, what is the probability of getting a total of 7?
Solution |
7
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How many 5 digit even numbers with distinct digits can be formed using the digits 1, 2, 5, 5, 4?
Solution |
8
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In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?
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9
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Find the probability that a leap year selected at random will contain 53 Sundays
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10
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A polygon has 44 diagonals. What is the number of its sides?
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