题目
A manager will select 20 bonds out of his universe of 100 bonds to construct a portfolio. Which formula provides the number of possible portfolios?
选项
A.Permutation formula
B.Multinomial formula
C.Combination formula
答案
C
解析
： C is correct. The combination formula provides the number of ways that r objects can be chosen from a total of n objects, when the order in which the r objects are listed does not matter. The order of the bonds within the portfolio does not matter. ： C正确。 组合公式提供了从总共n个对象中选择r个对象的方法的数量，而r个对象的排列顺序并不重要。投资组合中债券的顺序并不重要。