Olympiad Corner: No. 371

[摘要] Mim has a deck of 52 cards, stacked in a pile with their backs facingup. Mim separates the small pile consisting of the seven cards on the top of thedeck, turns it upside down, and places it at the bottom of the deck. All cards areagain in one pile, but not all of them face down; the seven cards at the bottomdo, in fact, face up. Mim repeats this move until all cards have their backs facingup again.

[学科分类] 数学（综合）