At this time, p = 2/3 *1/2 * (1-2/5)+2/3 * (1-kloc-0//2) * 2/5+(1-2/3).
The probability that all three people pass is p = 2/3 *1/2 * 2/5 = 2/15.
Therefore, the total p =2/5+2/ 15=8/ 15.
So the probability of at least two people passing is 8/ 15.