求教gwd14的两个数学问题

yuqing90 · 发表于 2012-4-25 22:32:31

Q5:
A certain club has 20 members.What is the ratio of the member of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?

A.16 to 1
B.15 to 1
C.16 to 5

D.15 to 6
E.5 to 4
Answer: c
这个题是啥意思啊没读懂

Q32:

r	s	t
u	v	w
x	y	z

Each of the letters in the table above represents one of the numbers 1, 2, or 3, and each of these numbers occurs exactly once in each row and exactly once in each column.What is the value of r?
(1)v + z = 6
(2)s + t + u + x = 6

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: d
这个是之前好像也见过我总觉得应该是b但是不知道a为什么也可以的请各位大侠赐教呀~

求教gwd14的两个数学问题

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