Mathematics · Permutations and Combinations
In a rectangular standing arrangement of persons in 4 rows, each row having 4 persons, the person at position (i, j) is asked to move to the position (j, i) for all i = 1, 2, 3, 4 and j = 1, 2, 3, 4. How many persons have changed their original position?
- 14
- 25
- 312✓
- 416
Correct answer
12
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