Talk:Fate/EXTRA CCC Collaboration Event/@comment-26948189-20170427013134/@comment-28242634-20170428041602

This is rather simple formula for it.

0.99^X = 0.01

Answer is 459 roll.

But we have like 20+ SSR's at the pool...so roughly, you have to do 459 rolls for 20 times or 459 x 20 = 9180 rolls for a sure SSR.