Danny Gregory (Everday Matters) is offering some nice prizes for the best illustrated letters he receives before Christmas.
I think this is a fun idea!
BrainTwister #85: Factorial squares
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From New Scientist #3555, 9th August 2025 [link] [link] N! (N factorial) is
the product of all the numbers from 1 to N. For example, 4! = 4 × 3× 2 × 1
= 24...
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