The program for finding the no of shuffle and shuffle(s) where on error took place , and the location of error

Question

double card error in riffle shuffle, where two cards from one plus come together followed by two cards from another pile. the net effect is that to interchange two adjacent cards in the pile
ex 1,27,2,28,3,29,....26,52
1,27,2,28,3,29....52
in this 2and 28 get interchange

Answer 1

Hum, is it me or did you forget to add the question ? :/