Three unbiased coins are tossed. What is the probability of getting at most two heads ?
3/4
1/4
3/8
7/8
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1
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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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2
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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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3
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Find the number of ways in which mixed double tennis game can be arranged amongst 9 married couples if no husband and wife play in the same game
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4
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How many parallelograms will be formed if 7 parallel horizontal lines intersect 6 parallel vertical lines?
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5
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What is the probability of getting at least one six in a single throw of three unbiased dice?s
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6
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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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7
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A, B, C, and D are four points, any three of which are non-collinear. Then, the number of ways to construct three lines each joining a pair of points so that the lines do not form a triangle is
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8
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In how many different ways can the letters of the word 'OPTICAL' be arranged so that the vowels always come together?
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9
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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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10
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Ten participants are participating in a competition. In how many ways can the first three prizes be won?
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