[計量] In a graduating class of 236 ...
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In a graduating class of 236 students, 142 took algebra and 121 took
chemistry. What is the greatest number of students that could have taken
both algebra and chemistry?
(a) 21
(b) 27
(c) 37
(d) 121
(e) 142
Ans: (d)
可以解釋一下嗎 感謝!!
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