Book Maths Puzzle

In how many ways can 10 software engineers and 10 civil engineers be seated in a row so that they are positioned alternatively?

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Book Other Question

In how many ways can 11 software engineers and 10 civil engineers be seated in a row so that they are positioned alternatively? Kiran has 8 black balls and 8 white balls. In how many ways can he arrange these balls in a row so that balls of different colours are alternate?