A number lock on a suitcase has 3 wheels each labeled with 10 digits from 0 to 9. If the opening of the lock is a particular sequence of three digits with no repeats, how many such sequences will be possible?
720
760
780
680
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1
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The number of triangles that can be formed by choosing the vertices from a set of 12 points, seven of which lie on the same straight line, is
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2
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12 person are seated at a round table. Number of ways of selecting 2 persons not adjacent to each other is
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3
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If C(n, 7) = C(n, 5), find n
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4
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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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5
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From a pack of 52 playing cards, two cards are drawn together at random. Calculate the probability of both the cards being the Kings.
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6
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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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7
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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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8
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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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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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How many parallelograms will be formed if 7 parallel horizontal lines intersect 6 parallel vertical lines?
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