Diketahui suatu barisan aritmetika :
136; 131, 75; 127, 5;...
Jika suku ke-n barisan tersebut bernilai nol, n = ...
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b= 131-136= -5
Un = a+(n-1)b
0 = 136+(n-1)-5
0 = 136-5n+5
0 = 141-5n
5n = 141-0
n = 141÷5 = 28