When the host removes a box that didn't win the prize, the probability of the remaining boxes winning the prize is still 2/3.
Therefore, if Zhang Kai changes his choice, the probability of winning the prize will increase.
(Actually, we can consider a more extreme situation: 100 boxes, and only one box wins the prize. When you choose a box, the host will take away the remaining 98 boxes, but there is no reward. Is the box in the host's hand easier to win the prize? Yes, it's 99/ 100)
1) Zhang Kai's winning probability is1/3 *1/2 =1/6.
2) The probability of Zhang Kai winning the prize is 2/3* 1/2= 1/3.
Stage Work and Stage Work Summary 1
I was assigned to _ _ _ _ as a driver in June 2000, and now I report my study and job