How many ways are there for arranging letters of the word AMAZING such that the ‘I’ appears between the two ‘A’s?
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In how many ways can 6 boys be allotted into 5 rooms such that no room is empty and all 6 boys are accommodated?
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How many 3-digit numbers greater than 500 contain the digit 9 appearing at least once?
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A bag contains 4 blue, 5 white and 6 green balls. Two balls are drawn at random. What is the probability that one ball is white?
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From a pack of 52 cards, we draw one by one, without replacement. If f(n) is the probability that an Ace will appear at the nth turn, then
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