How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
91
71
51
81
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1
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In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
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2
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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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3
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If (n + 2)! = 2550 (n!); find ’n’
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4
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There are 20 people among whom two are sisters. Find the number of ways in which we can arrange them around a circle so that there is exactly one person between the two sisters.
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5
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A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?
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6
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A speaks truth in 75% cases and B in 80% of the cases. In what percentage of the cases are they likely to contradict each other, narrating the same incident?
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7
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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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8
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How many 4letter 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 natural numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
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10
Discuss

In how many ways can the letters of the word 'LEADER' be arranged?
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