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(Indiana College Mathematics Competition) A card-shuffling
Chapter 5, Problem 70E(choose chapter or problem)
(Indiana College Mathematics Competition) A card-shuffling machine always rearranges cards in the same way relative to the order in which they were given to it. All of the hearts arranged in order from ace to king were put into the machine, and then the shuffled cards were put into the machine again to be shuffled. If the cards emerged in the order 10, 9, Q, 8, K, 3, 4, A, 5, J, 6, 2, 7, in what order were the cards after the first shuffle?
Questions & Answers
QUESTION:
(Indiana College Mathematics Competition) A card-shuffling machine always rearranges cards in the same way relative to the order in which they were given to it. All of the hearts arranged in order from ace to king were put into the machine, and then the shuffled cards were put into the machine again to be shuffled. If the cards emerged in the order 10, 9, Q, 8, K, 3, 4, A, 5, J, 6, 2, 7, in what order were the cards after the first shuffle?
ANSWER:Step 1 of 2
Let denote the permutation of positions induced by a shuffling.
We denote the ace to king as 1 through 13. Then,
In cycle notation, it can be written as
Therefore,