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Lazzo Matumbi Informação geral Nome completo Lazzo Matumbi Calimeiro Local de nascimento Salvador, BA Nacionalidade   Brasileiro Gênero(s) MPB, música negra, reggae, axé, afoxé Ocupação(ões) Cantor, compositor ...

up vote 1 down vote favorite 1 Lets say I have 20k people.(k>0) Lets say 15k boys 5k girls. If I want to make k groups of 15 boys and 5 girls, where inner ordering of the group does matter(it can be girl boy boy ... or whatever) - point is the boys and girls are mixed within a group. How do I do it? From my understanding 15 boys,then 5 girls in the following way 15k,15k-1,...15k-14,5k,5k-1,...5k-4,... and this way we arrange a row of 15 boys followed by 5 girls. In total its (15k)!(5k)!. Now we can divide by 15! and 5! to get rid of the inner ordering between boys and girls respectively, and then divide by k! to get rid of between the groups. But how do I go from here - or in a completely different way - and make order in each group between the 15 boys and girls. comb...