นิพจน์ 3: "F" left parenthesis, "n" , right parenthesis equals Start sum from "k" equals 0 to "n" , end sum, left parenthesis, negative 1 , right parenthesis Superscript, "k" , Baseline nCr left parenthesis, "n" , "k" , right parenthesis "a" left parenthesis, "n" minus "k" , right parenthesisFn=n∑k=0−1knCrn,kan−k
3
นิพจน์ 4: Start sum from "n" equals 0 to 100, end sum, left parenthesis, negative 1 , right parenthesis Superscript, "n" , Baseline "a" left parenthesis, "n" , right parenthesis100∑n=0−1nan
4
นิพจน์ 5: Start sum from "n" equals 0 to 10, end sum, StartFraction, left parenthesis, negative 1 , right parenthesis Superscript, "n" , Baseline "F" left parenthesis, "n" , right parenthesis Over 2 Superscript, "n" plus 1 , Baseline , EndFraction10∑n=0−1nFn2n+1