Talk:Biscotti/@comment-33234355-20180809142708/@comment-32317026-20180812110226

@azwraithz, 0.03% is simply 0.02^2 x 0.98^13, which is the chance of getting her twice in a specific way, like getting her on the first 2 summons, or on the first and last summon. There are 105 different ways to draw 2 Biscotti in 15 summons, so the total probability is

[Chance of getting her twice in a specific way] x [Number of possible ways] = 0.98^13 x 0.02^2 x 15!/13!/2! = 0.0003 x 105 = 0.03 = 3%

NOTE: n! = n x (n-1) x (n-2) x ... x 3 x 2 x 1