[計量] 請教陳向東一題
p260
14. A jar contains 20 marbles: 4 red, 6 white, and 10 blue. If you remove
marbles one at a time, randomly, what is the minimum number that must
be removed to be certain that you have at least 2 marbles of each
color?
(A) 6
(B) 10
(C) 12
(D) 16
(E) 18
這題的答案是(E)。最後一句話"at least 2 marbles of each color",我翻成:每種
顏色至少二個?但看他給的答案我應該是翻錯了。但看起來也不太像是最後只剩下二個
marbles。是不是我搞錯題目的意思了?
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