How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated
5
10
15
20
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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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10
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In a single throw with four dice,the probability of throwing seven is
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2
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A, B, C, D and E sit on five chairs all of which are facing north. C will sit only on the leftmost chair and B will not sit anywhere to the left of A. In how many ways they can be seated?
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3
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In how many ways can a cricketer can score 200 runs with fours and sixes only?
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4
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A teacher has to choose the maximum different groups of three students from a total of six students. Of these groups, in how many groups there will be included in a particular student?
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5
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There are 6 letters for 3 envelopes. In how many different ways can the envelopes be filled?
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6
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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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7
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If 18Cr = 18Cr+2 ; find rC5.
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8
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In how many different ways can the letters of the word 'CORPORATION' be arranged so that the vowels always come together?
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9
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If C(n, 7) = C(n, 5), find n
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