how many ways can 6 key be arranged in a key ring?
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Assume the ring as a circle with 6 position.
First position can be taken by any one of them.
The 2nd position has 5possibility, 3rd has 4, 4th has 3, 5th has 2 and 6th has 1
Totally, 5×4×3×2×1=120
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