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Question Number 35624 by abdo mathsup 649 cc last updated on 21/May/18
$${let}\:{R}_{{n}} \:=\:\sum_{{k}={n}+\mathrm{1}} ^{\infty} \:\:\frac{\mathrm{1}}{{k}!} \\ $$$${find}\:{a}\:{equivalent}\:{of}\:{R}_{{n}} \:\:{when}\:{n}\rightarrow+\infty \\ $$