Mastodawn

Gollum Mar 2

10!=10\*9\*8\*7\*6\*5\*4\*3\*2\*1

https://feddit.org/post/26532917

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NeatNit Mar 2

Fine, I’ll do the math:

60 seconds in a minute (10 × 6)

60 minutes in an hour (9 × 5 × 4 / 3)

24 hours in a day (8 × 3)

7 days in a week (7)

6 weeks (3 × 2)

The bold 3’s cancel out and become × 1, and then it’s easy to see each integer from 1 to 10 appears exactly once when it’s all multiplied together.

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Xavienth

Much easier to start if you know there are 3600 seconds in an hour. 36 is 9×4 and 100 is 10×5×2. Then 24 hours is 8×3, and 6 weeks gives you 6×7 (hand gesture).