Q25:

The buyer of a new home must choose 2 of 4 types of flooring and 2 of 6 paint colors. How many different combinations of type of flooring and paint color are available to the home buyer?

A. 4

B. 24

C. 48

D. 90

E. 96Answer: D

就只要C(2,4)*C(2,6)就可以了么？ 我怎么觉得还要乘4，因为这四种选出来后两两得再搭配

if we have to pick 1 of 2 apples and 1 of 2 oranges, how many combinations are there?

so c(2, 1) * c(2, 1) = 4 ((1, 1), (1, 2), (2, 1), (2, 2)); u do have to consider all the combos. between the two pairs, but the product of the two covers all the possible combinations.