2. Whats the odds of getting a multiple response question correct, when the answer can be a combination of 4?
-There are 4 choices
-Correct answer can be any one, all four, or any combination of 2 or 3
-Possible compinations: a, ab, ac, ad, abc, abd, acd, b, bc, bd, bcd, c, cd, d, abcd
= 15 combinations
