GWD24-4

debralee

4

A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black-and-white set?

1. 1/7  B. ¼  C. 5/14  D. 11/28  E. 13/26

这道题我算出来的是13/28, 思路是：１－C6^2/C8^2

 

大家看看是答案错了还是我错了？

anistonlucky

13/28, 对的

woodrowzt

同，我也是13/28