1. 3 Girls and 4 boys are to be seated in a row on 7 chairs in such a way that all the three girls always sit together. In how many different ways can it be done ?
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By: anil on 05 May 2019 01.28 am
Total number of persons = 3 + 4 = 7 The girls always sit together. Considering the three girls as 1 person, we have 5 persons which can be arranged in 5! ways But corresponding to each way of these arrangements, the girls can be arranged together in 3! ways. Hence, required number of words = $$5! imes 3!$$ = 120 * 6 = 720
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