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Find the number of permutations of 10 numbers in a spinner.
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I interpret the problem in different way.
My solution and my answer are different from that by @CPhill.
A dictionary gives me these 5 possible treatments of the term "spinner".
1 - one that spins
2 - a fisherman's lure consisting of a spoon, blade, or set of wings that revolves when drawn through the water
3 - a conical sheet metal fairing that is attached to an airplane propeller boss and revolves with it
4 - a movable arrow that is spun on its dial to indicate the number or kind of moves a player may make in a board game
5 - spin doctor.
Of these possible treatments, I will use #4 as the most adequate to the problem.
Then the adequate mathematical reformulation of the problem is THIS:
How many circular permutations are possible for 10 different numbers ?
The answer is commonly/widely known:
The number of different circular permutations of 10 different items is (10-1)! = 9! = 9*8*7*6*5*4*3*2 = 362880.
Solved.