\[LeftBracketingBar]((σ^((n+1)))/((n+1)!))\[RightBracketingBar]≤(1/(n+1))(\[LeftBracketingBar]((σ^((n)))/(n!))\[RightBracketingBar]+(∑_(k=1)^n) \[LeftBracketingBar]((σ^((k)))/(k!))\[RightBracketingBar]\[LeftBracketingBar]((σ^((n-k)))/((n-k)!))\[RightBracketingBar])