Ten participants are participating in a competition. In how many ways can the first three prizes be won?
920
680
720
820
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1
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How many rectangles can be formed out of a chess board ?
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2
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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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3
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In how many different ways can the letters of the word 'OPTICAL' be arranged so that the vowels always come together?
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4
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What is the sum of all 4 digit numbers that can be formed by the digits 1, 2, 3, 4 each exactly once
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5
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A polygon has 44 diagonals. What is the number of its sides?
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6
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How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), when the digit at the unit’s place must be greater than that in the ten’s place?
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7
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In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
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8
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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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9
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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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10
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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?
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