Two groups

The group of 10 girls should be divided into two groups with at least 4 girls in each group. How many ways can this be done?

Correct result:

n =  462

Solution:

C4(10)=(104)=10!4!(104)!=109874321=210  C5(10)=(105)=10!5!(105)!=10987654321=252  n=(104)+(105)=462



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