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You can arrange them in (20 x 19 x 18 x 17 x 16 x ..... 4 x 3 x 2) ways.

That number is called "20 factorial", and written " 20! ".

It's a big number ... bigger than my calculator can show exactly.

Rounded to the nearest billion, it's

2,432,902,008,000,000,000

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13y ago
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Q: How many different ways can you arrange the numbers 1 to 20?
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