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u/ATL-090

Image 1 — Is this true or not? And if it is then why?
Image 2 — Is this true or not? And if it is then why?
▲ 3 r/askmath

Is this true or not? And if it is then why?

So i was messing around with factorials on my notebook and i eventually came across this

(n!-(n-1)! )/(n-1)^2 = (n-2)! if n>=2

Also why does this work if this works?

Or am i just stupid and overthinking this?

u/ATL-090 — 3 days ago