Discussion @ 1934. Black Spot @ Timus Online Judge

uu_Innk how to get a 0.19 in the first test ? [3] // Problem 1934. Black Spot 10 Nov 2012 18:46

how to get a 0.19 in the first test ?
what formula ?

Andrew Sboev [USU] Re: how to get a 0.19 in the first test ? // Problem 1934. Black Spot 10 Nov 2012 21:45

Maybe, a + b - a * b? :)

DANGER Re: how to get a 0.19 in the first test ? // Problem 1934. Black Spot 27 Nov 2012 12:04

1-(1-p1)*(1-p2)

[]zhi (Bozhin Katsarski) Re: how to get a 0.19 in the first test ? // Problem 1934. Black Spot 5 Jan 2013 22:01

Both the formulas by Andrew Sboev and DANGER are correct, since they are actually one and the same (you can open the brackets in DANGER's formula to prove for yourself). http://boards.straightdope.com/sdmb/archive/index.php/t-143322.html Maybe this link will help you understand why. I hope I helped you :)

Discussion of Problem 1934. Black Spot