A group of 7 boys and 3 girls is to be photographed. ​(a) How many ways can they be arranged in one​ row? ​(b) How many ways can they be arranged with the girls in the back row and the boys in the front ​row?       ​(a) What expression should be evaluated to find the number of ways the boys and girls can be arranged in one​ row?     7​!+3​!   10​!   7​!   3​!

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