in how many ways can 3 girls and 5 boys be arrange in a row so that all the girls are together?
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treat all the girls as one unit. so there are 5 boys and one unit of girls. they all can be permuted and arranged in any manner.
so 6! ways. = 6*5*4*3*2*1
so 6! ways. = 6*5*4*3*2*1
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