请教gwd数学

assfgrtrtr

Q1: If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > 1/2?

(1)More than 1/2 of the 10 employees are women.

(2)The probability that both representatives selected will be men is less than1/10

为什么选E, B不对吗?

Q6: 这是最新题第一套,图形画不出了,能否帮我看一下?

In the figure shown, line segment AD is parallel to line segment BC. What is the value of x?

(1) y = 50

(2) z = 40

teyvhf

(2)The probability that both representatives selected will be men is less than1/10;没说一男一女的情况。

assfgrtrtr

但费费宝典的答案是B,

我也通过计算可求出n, Cn 2/ C10 2<1/10, 不只对不对?

himba

对，你说的对。没有仔细思考，可以求出最多men的个数，应该是3，从而得出p>1/2。