[計量] 請教一題
A certain class is evenly divided into 5 ratings A,B,C,D, and E.
If at least one of the ratings has 6 or more students, what is the least
total number of students in the class.
A.25
B.26
C.30
D.31
E.36
答案為B
小女子不才,怎麼想都覺得是5X6=30.....還是我搞錯題目的意思呢？
謝謝大家>"<
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