Seating arrangement

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It’s board examinations, and you are given duty to obtain sitting arrangement so that no one can cheat. There are 'a' number of maths student and 'b' number of biology student and total n number of seats in a given room. Now, it’s very secure examination, so department has decided to allow only one row in every classroom for students to sit, and some seats of the row are supposed to be left bla

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