之前成都申友GMAT说到了GMAT数学排列组合的专业术语和解题方法，今天我们直接以例题的形式展现，看看大家是不是都掌握了方法。
1、There are 6 groups in a room.Each group consists of 3 men.How manyhandshakes will there be if each man only shakes hands with people who are outside his group。
解析：
18C2 - 6(3C2) = 18X17/2 - 6(3X2/2) = 153 - 18 = 135. I) 18 peopleshake had with each other or18C2 II) Then subtract the hand shakeswithin each group. Six such group with 6 hand shakes each or 6 (3C2)
2、if you tossed a coin three times, what s the probability that you get the same side all three times.
解析：
the probability that you get one side 1/8 plus the probsbility that you get another side 1/8 totaling 1/4.
以上例题选自经典易错难题，成都申友GMAT提醒一下准备研究GMAT数学排列组合的同学，一定要熟练的掌握公式，将公式中的每一项举一反三的进行练习。
