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GRE考试中，虽说考生在GRE数学部分有着很大的优势，但对于复习也不能轻视，要把这个优势发挥最大的作用，提升GRE成绩，下面是GRE数学模拟练习题。 1. 从1,2,3,4,5,6,7,8,9中选出三个数字组成一个三位数,这个三位数的digits中有两个相同,另一个digit与其它两个都不同,问共有多少个这样的三位数? 72 144 180 216 54 2. 符合 X^2+Y^2=100的整数解共有多少对? 3. A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box,what is the probability that the sum of the three numbers on the balls selected from the box will be odd? 1/4 3/8 1/2 5/8 3/4 4. Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parrallel to the x-axis. The x-and y-coordinates of P,Q,and Rare to be integers that satisfy the inequalities -4=5,6=16,how many different triangles with these properties could be constructed? 110 1100 9900 10000 12100 | 
