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Maths Puzzle
A company has 11 software engineers and 7 civil engineers. In how many ways can they be seated in a row so that no two of the civil engineers will sit together?
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Book Other Question
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?
In how many ways can 11 software engineers and 10 civil engineers be seated in a row so that they are positioned alternatively?