How many parallelograms will be formed if 7 parallel horizontal lines intersect 6 parallel vertical lines?
42
294
315
258
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1
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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%?
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2
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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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3
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Four letters are selected from the word “CAPAME” and are rearranged to form four letter words. How many words can be formed?
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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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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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If
SolutionAnswer :1/2 |
7
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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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8
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In how many different ways can the letters of the word 'MATHEMATICS' be arranged so that the vowels always come together
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9
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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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10
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How many 5 digit even numbers with distinct digits can be formed using the digits 1, 2, 5, 5, 4?
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