SOLUTION: there are 5 red, 5 green, 5 blue and 5 yellow, each of which is inside one of the twenty identical, unmarked envelopes. What is the least number of envelopes that must be selected
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Question 1088563: there are 5 red, 5 green, 5 blue and 5 yellow, each of which is inside one of the twenty identical, unmarked envelopes. What is the least number of envelopes that must be selected in order to have at least 3 letters of the same color?
a. 4
b. 8
c. 9
d. 12 Answer by ikleyn(52787) (Show Source):
