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Gacha probability question

No.1494112 View ViewReplyOriginalReport
I only have less than an hour to decide, how can I tell my chances:
Playing a gacha which has 4 URs, you do 60 pulls at a time. So I've done it 5 times, got nothing for the first three 60 pulls. Then I got 2 of the URs on the fourth, and 1 UR on the fifth. All different. Still missing the last UR, what are the chances I get it if I do a 6th 60 pull?
Rates are 0.245% per UR, and dupes are possible.