2017年备考GMAT数学练习题

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There are 8 magazines lying on a table; 4 are fashionmagazines and the other 4 are sports magazines. If 3 magazines are to be selected at random from the 8 magazines, whatis the probability that at least one of the fashion magazines will be selected?

A. 1/2

B. 2/3

C. 32/35

D. 11/12

E. 13/14

　　答案

参考答案：E

题目翻译：桌子上八本杂志，四本时尚四本体育。随机三本，至少一本时尚的几率。

题目全解：1减去一本时尚没有的几率=1-(4/8)*(3/7)*(2/6)=13/14。

Is thesum of p^2 and q^2 greater than 1?

(1) pis greater than 1/2.

(2) qis greater than 1/2.

ement (1) ALONE is sufficient, but statement (2) alone is notsufficient.

ement (2) ALONE is sufficient, but statement (1) alone is notsufficient.

C. BOTHstatements TOGETHER are sufficient, but NEITHER statement ALONEis sufficient.

D. EACHstatement ALONE is sufficient.

ements (1) and (2) TOGETHER are NOT sufficient.

　　答案

参考答案：E

题目翻译：p方加q方大于一吗?

题目全解：P大于2分之1，p方大于4分之一;q大于2分之1，q方大于4分之一，p方加q方就大于2分之一，可比一大可比一小。一二条件独立也同理，选E.

What isthe median number of employees assigned per project for the projects at CompanyZ?

(1) 25percent of the projects at Company Z have 4 or more employees assigned to eachproject.

(2) 35percent of the projects at Company Z have 2 or fewer employees assigned to eachproject.

ement (1) ALONE is sufficient, but statement (2) alone is notsufficient.

ement (2) ALONE is sufficient, but statement (1) alone is notsufficient.

C. BOTHstatements TOGETHER are sufficient, but NEITHER statement ALONEis sufficient.

D. EACHstatement ALONE is sufficient.

ements (1) and (2) TOGETHER are NOT sufficient.

　　答案

参考答案：C

题目翻译：公司Z，做项目的员工的中位数是几?

题目全解：(1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project. Not sufficient on its own.

(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project. Not sufficient on its own.

(1)+(2) Since 35% of of the projects have 2 or fewer employees and 25% of the projects have 4 or more employees, then 100%-(25%+35%)=40% of the projects have exactly 3 employees assigned to each of them. So, the median number of employees assigned per project is 3. Sufficient.

What isthe sum of the integers from -190 to 195, inclusive?

A. 0

B. 5

C. 375

D. 875

E. 965

　　答案

参考答案：E

题目翻译：负190到正195，整数的和是多少呀?

题目全解：-190到190都抵消了，答案是191+192+193+194+195=965.