The purpose of this problem is to test the formula of "combination". The formula is "the lower right corner of C is 10, and the upper right corner is 7", which means the probability of choosing 7 from 10 (you can't type this formula here)//The fastest way to solve this problem is to calculate the probability that five people won't win the prize! -Corresponding to "at least one person won the prize" is "no one won the prize"//

Five people who didn't win the prize (all bought the prize paper that didn't win the prize) got the result of "5 out of 7", and five people got the result of "10" in the lottery.

So the probability of five people not winning the prize = "5 out of 7" divided by "5 out of 65438+00"

Then the remaining probability is "the probability of winning at least 1 person".

Probability of winning at least 1 person:

=1-("C lower right 7, upper right 5" divided by "C lower right 10, upper right 5")

You have to do the math yourself! )