@MartinSleziak Hi I am high school student solving problems. On permutation and combinations, a problem is in party there are 5 Russian and 5 British couple, we have to find total no of shake hands if Russian women will. Not hand shake with any man, and any women will not shake hand with her own husband
What I do is total hand shakes are 190,i minus shakes hand between Russian women and British man that is 25 - shake hands of us Russian women with her own husband, - shake of British ladies with their husband am I right or I missed an case will anybody help me