[計量] 請教陳向東數學三題
此題為陳向東"最新GRE數學預測模擬試題(一)"，p257
16. Draw all diagonals in a regular eight-sided polygon. What is the
largest number of diagonals that meet in a single point?
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6
這題的答案是(C)，除了用畫圖以外我想不太到有什麼好的方法可以解
下面二題為陳向東"最新GRE數學預測模擬試題(三)"，p265
24. The 20 people at party are divided into n mutually exclusive groups
in such a way that the number of people in any group does not exceed
the number in any other group by more than 1.
Quantity A Quantity B
The value of nif at least
one of the groups consists 6
of 3 people
這題的答案是D，但是我看不懂Quantity A中"the valure of nif"的意思。
25. In a group of 100 students, more students are on the fencing team
than are members of the French club. If 70 are in the club and 20
are ntither on the team nor in the club, what, is the minimum
number of students who could, be both on the team and in the club?
(A) 10
(B) 49
(C) 50
(D) 60
(E) 61
這題的答案是(E)，但我怎麼算都弄不出這個答案！
請好心的高手幫忙指點~~謝謝了！
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