Potato chips are on sale, buy 2 get 1 free. There are only 9 bags of chips left (4 plain and 5 bbq). A shopper randomly grabs 3 bags. What is the probability the shopper will grab exactly 3 bags of bbq chips?	Choose the correct choice from the following:
A) 2/3
B) 1/3
C) 1/5
D) 5/42
E) 7/42
Combination Probability Formula: nCr = n!/[r!(n-r)!]   Total possible, select 3 bags from 9 bags = 9C3 = 9!/[3!(9 - 3)!] = 84.   To have 3 bbq there must be 0 plain, select 0 plain from 4 = 4C0 = 1.   And, select 3 bbq from 5 = 5C3 = 10.   3 bbq and 0 plain = (1)(10) = 10   Probability = (number outcomes favorable)/(total number outcomes) = 10/84 = 5/42   Answer: 5/42
<result>D</result>
Potato chips are on sale, buy 2 get 1 free. There are only 9 bags of chips left (4 plain and 5 bbq). A shopper randomly grabs 3 bags. What is the probability the shopper will grab exactly 3 bags of bbq chips?