[求助]PREP1 DS继续寻求牛人来帮忙解答啊

ricken_ivy

84. 7517-!-item-!-187;#058&005572 If p is a prime number greater than 2, what is the value of p ?

(1) There are a total of 100 prime numbers between 1 and p + 1.

(2) There are a total of p prime numbers between 1 and 3,912.

Ans: (D)

114. 11816-!-item-!-187;#058&007868 Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was $20.

(2) The regular price of the least expensive item was $15.

Ans: (A)

125. 12932-!-item-!-187;#058&009020 The sequence a1, a2, a3, . . . , an of n integers is such that ak = k if k is odd and ak = -ak - 1 if k is even. Is the sum of the terms in the sequence positive?

(1) n is odd.

(2) an is positive.

Ans: (D)

131. 13306-!-item-!-187;#058&009213
The positive integer k has exactly two positive prime factors, 3 and 7. If k has a total of 6 positive factors, including 1 and k,what is the value of k ?

(1) 32 is a factor of k.

(2) 72 is not a factor of k.

Ans: (D)

167. 16626-!-item-!-187;#058&010859 If x, y, and z are integers and xy + z is an odd integer, is x an even integer?

(1) xy + xz is an even integer.

(2) y + xz is an odd integer.

Ans: (A)

169. 16735-!-item-!-187;#058&010875 If the integers a and n are greater than 1 and the product of the first 8 positive integers is a multiple of an, what is the value of a ?

(1) an = 64

(2) n = 6

Ans: (B)

176. 17491-!-item-!-187;#058&011140 If x and y are positive integers, is the product xy even?

(1) 5x - 4y is even.

 (2) 6x + 7y is even.

Ans: (D)

202. 19528-!-item-!-187;#058&012279 Each employee of Company Z is an employee of either Division X or Division Y, but not both. If each division has some part-time employees, is the ratio of the number of full-time employees to the number of part-time employees greater for Division X than for Company Z ?

(1) The ratio of the number of full-time employees to the number of part-time employees is less for Division Y than for Company Z.

(2) More than half of the full-time employees of Company Z are employees of Division X, and more than half of the part-time employees of Company Z are employees of Division Y.

Ans: (D)

顺便问下哪里能找到比较好的PS的版本呢之前下载的好多都是不完整的，跪求！！！