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Maths Puzzle
In how many ways can 11 persons be arranged in a row such that 3 particular persons should always be together?
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Book Other Question
In how many ways can 8 distinguishable balls be put in to 5 distinguishable boxes if any box can contain more than one ball?
In how many ways can 9 different colour balls be arranged in a row so that black, white, red and green balls are never together?