Selecting which ten players will be in the relay game on a 15 persons team. - 15C10, Kelly is setting the four digit lock. He is considering of different ways to use the digits 2,4,1,3 and 8. - 5P4, There are 25 applicants for five IT expert positions - 25C5, A team of 13 volleyball players needs to choose captain and co-captain. - 13P2, Selecting which seven players will be in the relay game on an eight person team - 8C7, The student body of 10 students wants to elect a president, vice-president, secretary and treasurer. - 10P4,

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