Card trick


Let secretly choose any card in a N = cards deck (< 100).
Deal one card at a time into P = rows, (5 rows max), and ask in which row is the card
take the rows and do T = turns, (4 turns max).
In each turn take P-1-ri rows, then the said row, then the remaining ri rows.
The choosen card is then the (u+1)th card.

 

 

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