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Problem 156
Combinatorics Difficulty 1.2 Multiple choice CEMC Gauss (Grade 8) · Canada · 2018
Evgeny has 3 roses, 2 tulips, 4 daisies, and 6 lilies. If he randomly chooses one of these flowers, what is the probability that it is a tulip?
Pick one
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Official solution
The cost of nine $1 items and five $2 items is (9×$1)+(5×$2), which is $9+$10 or $19.
The correct answer is (C).
(We may check that each of the remaining four answers gives a cost that is less than $18.)
Source: CEMC, University of Waterloo,
licensed CC-BY-NC-4.0.
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