GWD24 数学错了很多,急需NN指点
2.if p, s, and t are positive prime numbers, what is the value of p^3s^3t^3?(data sufficiency)
(1) p^3st=728
(2) t=13
answer:A,可我觉得应该是E.
4.A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black-and-white set?
A. 1/7 B. ¼ C. 5/14 D. 11/28 E. 13/26
答案为E。可我觉得应该是13/28
9.The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?(data sufficiency)
(1) 0*2=2
(2) 2*0=2
答案为A，我选E
12 During a 10-week summer vacation, was the average (arithmetic mean) number of books that Carolyn read per week greater than the average number of books that Jacob read per week?(data sufficiency)
(1) Twice the average number of books that Carolyn read per week was greater than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books more than Jacob.
答案选A,我觉得选E,
16 From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?(data sufficiency)
(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504
(2) During this period of time, the increase in the balance in the checking account was 8 percent.
答案选A,我选C.
18The annual interest rate earned by an investment increased by 10 percent from last year to this year. If the annual interest rate earned by the investment this year was 1 percent, what was the annual interest rate last year?
A. 1% B. 1.1% C. 9.1% D. 10% E. 10.8%
答案选C
26 Does the decimal equivalent of P/Q, where P and Q are positive integers, contain only a finite number of nonzero digits?(data sufficiency)
(1) P>Q
(2) Q=8
答案选E
28If k=-1, which of the following is (are) true?
1. k^k=k 2. | k| =-k. 3.k^0=-k
A. 1 only B. 1 and 2 only C. 1 and 3 only
D. 2 and 3 only E. 1. 2. and 3.
答案选E,我选B
