permutation and combination

Question

from a group of 6 people which of the following could be the ratio of the different groups of x people teams that can be selected to the different groups of y people teams that can be selected ,where x<y-2

 

(a)15

(b)6

(c)10/3

(d)5/2

(e)2/5

Answer 1

Since the factors of 6 are 1, 2, 3, and 6. The groups of people that can be chosen such that the factors have a difference of two is (are) 1:3.