Originally Posted by Neko

Would be impossible to determine. Since i needed like 150 tickets or so ( using only +1 r gacha, or 1 peronamin at a time ) to get the SR first time, and then tenhou got her's in first ticket, then another in few tickets later.
Later that day in few tickets i got it again too.

How would it be impossible to determine? All you'd need is a couple people that throw a beforehand specified amount of consumables at Kurito, track all the rewards and then you add it all up and you could have a somewhat accurate display of the odds.

Now in the middle of this Kurito season most people probably won't be all too keen on spending all their R-gachas on Kurito, but if you could get a bunch of people to track this at the start of the next Kurito season where they'll be giving her lots of stuff for the new cards anyway I don't see why it couldn't work.