Lovelive drew a yellow calendar.

How to calculate this ... Well, I'll give you a probability of at least two URs for 1 1 company.

p 1= 1-[c( 1 1, 1)* 1%*(99%)^ 10]-[(99%)^ 1 1]≈0.005 17972≈0.5%

And the probability that 1 1 company produces exactly two URs is:

p2=[c( 1 1,2)* 1%* 1%*(99%)^9]≈0.00502434≈0.5%

In strict accordance with the results of classical probability calculation.

As for why p1>; P2, because the first case includes the second case.

So if I remember correctly, according to the normal distribution curve, we can know that if you draw with 1 1 200 times, there will be a 68% probability of two such URs. I don't know if this is accurate. I haven't calculated it, but the one above is correct.