If 18Cr = 18Cr+2 ; find rC5.
56
63
49
42
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1
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From a group of 7 men and 6 women, five persons are to be selected to form a committee so that at least three men are in the committee. In how many ways can it be done?
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2
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Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?
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3
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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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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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In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?
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6
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If four dice are thrown together, then what is the probability that the sum of the numbers appearing on them is 25 ?
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7
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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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8
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The number of circles that can be drawn out of 10 points of which 7 are collinear is
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9
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Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart, is
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10
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One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is not a face card (Jack, Queen and King only)?
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