00:01
So you said that you're buying 50 lottery tickets.
00:05
And now the probability of winning, yours says frack and then 1 ,100.
00:13
So i don't know what this means.
00:15
I'm going to assume that it's one out of 1 ,000 this, or i'm just going to call it p.
00:22
And then you can figure out plugging in the number.
00:26
In yours, you wanted to find what's the probability of having at least one winning ticket.
00:33
And then you want to define the probability of exactly one winning ticket.
00:37
And then you want to define the probability of at least two winning tickets.
00:42
And i'm having x stand for the number of winning tickets.
00:46
And this would follow a binomial probability.
00:49
And we would say p is the probability that you win.
00:52
And then one minus p is the probability you lose.
00:56
And we are getting 50 tickets.
00:58
So this is going to most easily done by doing one minus the probability of getting no winning tickets.
01:06
And that will be equivalent to one minus, and then we would normally use a combination of 50, choose zero, and then we would take that p of winning and take it to the zero of power, and then the one minus p would be taken to the 50th power...