Question Number 170909 by mathlove last updated on 03/Jun/22
$$\mathrm{1}!+\mathrm{2}!+\mathrm{3}!+....+\mathrm{20000}!=? \\ $$
Commented by MJS_new last updated on 04/Jun/22
$$\mathrm{are}\:\mathrm{you}\:\mathrm{serious}?\:\mathrm{even}\:\mathrm{if}\:\mathrm{somebody}\:\mathrm{could}\:\mathrm{give} \\ $$$$\mathrm{you}\:\mathrm{the}\:\mathrm{exact}\:\mathrm{number},\:\mathrm{what}\:\mathrm{would}\:\mathrm{you}\:\mathrm{use} \\ $$$$\mathrm{it}\:\mathrm{for}? \\ $$$$\mathrm{20000}!\approx\mathrm{10}^{\mathrm{66023}} \\ $$
Commented by mathlove last updated on 04/Jun/22
$$ \\ $$I want to learn the formula for correct counting
Commented by Skabetix last updated on 04/Jun/22
Commented by MJS_new last updated on 04/Jun/22
$$\mathrm{I}\:\mathrm{remember}\:\mathrm{a}\:\mathrm{different}\:\mathrm{version}. \\ $$$$\mathrm{Anyway}\:\mathrm{to}\:``\mathrm{learn}\:\mathrm{the}\:\mathrm{formula}''\mathrm{one}\:\mathrm{nust} \\ $$$$\mathrm{be}\:\mathrm{able}\:\mathrm{to}\:\mathrm{deduce}\:\mathrm{and}\:\mathrm{prove}\:\mathrm{it}.\:\mathrm{In}\:\mathrm{my}\:\mathrm{opinion} \\ $$$$\mathrm{it}\:\mathrm{makes}\:\mathrm{no}\:\mathrm{sense}\:\mathrm{trying}\:\mathrm{to}\:\mathrm{learn}\:\mathrm{mathematics} \\ $$$$\mathrm{by}\:\mathrm{picking}\:\mathrm{out}\:\mathrm{advanced}\:\mathrm{problems}\:\mathrm{without} \\ $$$$\mathrm{yet}\:\mathrm{understanding}\:\mathrm{the}\:\mathrm{foundations}. \\ $$