How many 4letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed?
40
400
5040
2520
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1
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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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2
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How many words can be formed from the letters of the word "SIGNATURE" so that vowels always come together.
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3
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A fair coin is tossed 5 times. What is the probability of getting at least three heads on consecutive tosses?
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4
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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5
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How many rectangles can be formed out of a chess board ?
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6
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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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7
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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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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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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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10
Discuss

Three chairs are arranged in a row facing three other chairs. 4 boys and 2 girls are to be seated on these chairs such that girls are always facing each other. In how many ways can they be seated?
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