[計量] 題目有點看不太懂
題目:
Of certain of 50 people, 30 live in Country R,12 were born in December, and
25 are accounts. What is the greatest possible number of the people in the
group who do not live in Country R, were not born in December, and are not
accounts?
正確答案是20 小弟一開始選的是38 我想問的是 題目要問的為什麼不是三個條件的交集
(and)而是聯集(or)呢? 想請板上的大大幫忙解釋一下ORZ 我看了好幾遍還是覺得用
and應該是要三個條件同時滿足(who 所引導三個平行定語修飾) 感覺我對這敘述好像誤解
了什麼...
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