Marco is putting some sweaters into storage for the winter. He has 10 sweaters, and he can fit 6 sweaters into a box. How many different groups of 6 sweaters can Marco pack into a box?
Let us represent the slots of sweaters with dashes: _ , _ , _ , _ , _ , _ The first slot has 10 possibilities, the next has 9, the next has 8 and so on. 10 x 9 x 8 x 7 x 6 x 5 = 151200 arrangements
