A biased coin in tossed thrice. What is the probability that heads turns out at least twice considering that the probability of a head is 60%?
0.648
0.234
0.348
.839
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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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A fair coin is tossed 5 times. What is the probability of getting at least three heads on consecutive tosses?
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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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Find the probability that a leap year selected at random will contain 53 Sundays
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A fiveletter word is to be formed from a group of 5 vowels and 4 consonants, using at least one vowel and at least one consonant. In how many ways the word having a greater number of consonants than vowels can be formed?
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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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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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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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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If (n + 2)! = 2550 (n!); find ’n’
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