北美9.28考的 720 一点心得和机经

状态很重要!!  作了再多的模拟考到时候还是会有点紧张所以一定要注意pace.不要在一道题上吊死。实在不知道就排除法。Math 我做到一半时被一道题难住。浪费了太多时间. 最后１０道题时间很紧.

Math
JJ  要看。但是对答案不确认的JJ 还是看自己的直觉吧.   我没有看AWA ＆Verbal JJ。 个人认为因为这两部分还是主要看平时基本功。临时是抱不了佛脚的。

没能记住太多题。 不好意思

Math:

1 )There are 7 male and 5 female.  If forming a committee with 3 male and 2 female.  How many combo are there?

2)
For an event, 3 outcomes x, y, z have the possibility of occurring 25%,
35% and 40% respectively.  If the event happened 3 times.  Which of
these formula shows that outcome z happen exactly 2 times?

有很多很搞的比较题。 

2)
For an event, 3 outcomes x, y, z have the possibility of occurring 25%,35% and 40% respectively.  If the event happened 3 times.  Which of these formula shows that outcome z happen exactly 2 times?
是不是：2C3*(2/5)^2(1-2/5)

xzz与yzz是不一样的outcomes.

同样，xzz与zxz也是不一样的outcomes

0.4×0.4×0.6我觉得直接这样哦～～

Which of these formula shows that outcome z happen exactly 2 times?

只问发生2次 不存在排列吧～

谢谢楼主。

同意JJJooe的答案