Question
In how many ways can live boys and three girls sit in a row such that all boys sit together?
Answer: Option C
TREAT ALL BOYS AS ONE UNIT. NOW THERE ARE FOUR STUDENTS AND THEY CAN BE ARRANGED IN 4! WAYS. AGAIN FIVE BOYS CAN BE ARRANGED AMONG THEMSELVES IN 5! WAYS.
REQUIRED NUMBER OF ARRANGEMENTS = 4! * 5! = 24 * 120 = 2880.
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TREAT ALL BOYS AS ONE UNIT. NOW THERE ARE FOUR STUDENTS AND THEY CAN BE ARRANGED IN 4! WAYS. AGAIN FIVE BOYS CAN BE ARRANGED AMONG THEMSELVES IN 5! WAYS.
REQUIRED NUMBER OF ARRANGEMENTS = 4! * 5! = 24 * 120 = 2880.
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