3 Data Sufficiency Qs asked for help!!!???[求助]

fernandochang

3.S is a set containing 9 different numbers. T is a set containing 8 different numbers, all of which are members of S. Which of the following statements CANNOT be true?
(A)The mean of S is equal to the mean of T
(B)The median of S is equal to the median of T
(C)The range of S is equal to the range of T
(D)The mean of S is great than the mean of T
(E)The range of S is less than the range of T
(A: E

4.Right traingle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis, The x-and y-coordinates of P,Q, and R are to be integers that satisfy the inequalities -4≦x≦5 and 6≦y≦16. How many different triangles with these properties could be constructed?
(A)110
(B)1,100
(C)9,900
(D)10,000
(E)12,100
(A: C

5. A square countertop has a square tile inaly in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of the strip?
I.1 &1/2
II.3
III. 4 &1/2
(A)I only
(B)II only
(C)I and II only
(D)I and III only
(E)I, II and III
(A:E

oddyuibe

Well, it seems these three questions don't belong to Data Sufficiency section,hehe
1, I think E is the answer, since the range of S should be at least as same as that of T.

2, for P,the number of possible point is C10,1*C11,1; for each possible P, the number of possible Q is 10, and the number of possilbe R is 9. (PQR is a right triangle and PR is parallel to the X-axsis )
So the answer should be: C10,1*C11,1*10*9=10*11*10*9=9,900

3, Because we don' know the width of the square, according to my understanding, as long as it is a positive number, it will be ok in this case. I don't know whether I am right or not. Anybody can help? Thanks