How many natural numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
496
728
486
1084
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1
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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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2
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How many words, with or without meaning, can be formed using all letters of the word EQUATION using each letter exactly once?
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3
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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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4
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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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5
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In how many ways can 10 people line up at a ticket window of a railway station?
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6
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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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7
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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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8
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There are seven pairs of black shoes and five pairs of white shoes. They are all put into a box and shoes are drawn one at a time. To ensure that at least one pair of black shoes are taken out, what is the number of shoes required to be drawn out?
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9
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If (n + 2)! = 2550 (n!); find ’n’
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10
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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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