Susana compró camisetas a juego para ella y su hija pequeña, Sonia. Algunos días más tarde, Sonia entró en la cocina llevando una camiseta que le quedaba como un guante, perfecta. Susana supo de inmediato que era la camiseta que se había comprado para ella y que había encogido mucho. ¿Cómo sabía que era su camiseta y no la que había comprado para su hija?

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?