How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), when the digit at the unit’s place must be greater than that in the ten’s place?
60
54
51 / 3
2 x 4!
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1
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In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?
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2
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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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3
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If A, B and C are mutually exclusive and exhaustive events of a random experiment such that P(B)=3/2P(A) and P(C)=1/2P(B), then P(A∪C)=
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4
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A basketball team of 5 players is to be selected from a group of 10 men and 8 women players. A volley ball team of 6 players is to be selected from a group of 8 men and 7 women players. Find the difference in the number of ways in which both the teams are selected, given that each team has only 2 female players.
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5
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How many words can be formed from the letters of the word "SIGNATURE" so that vowels always come together.
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6
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How many natural numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
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7
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How many parallelograms will be formed if 7 parallel horizontal lines intersect 6 parallel vertical lines?
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8
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How many 4-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed?
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9
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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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10
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If (n + 2)! = 2550 (n!); find ’n’
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