Math 1, coin toss 100, at least 1 rise probability? 2. Choose 1 lottery at 49, and choose 25 numbers. What is the probability of winning 1 or above in five periods?

The reciprocal of 1 and (at least 1 time) is (not once). First, find out the probability of not once: 1 2 to the power of 100, so the probability of throwing a coin 100 times and at least 1 time is

2, 49 choose 1, choose 25 numbers, the probability of not winning is 24 out of 49, and the probability of not winning all the prizes in five periods is the fifth power of (24 out of 49), so 49 choose 1 lottery, choose 25 numbers, and the probability of winning in five periods 1 and above is (/kloc-