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Barisan bil. Genap → un = 2n
Bil. Segitiga pascal → un = 2 pangkat n-1
Bil. Persegi → un= n²
Bil segi tiga → un= 1/2n (n+1)
Bil. Persegi panjang → un= n(n+1)
Aritmatika → un = a+(n-1)b
→ sn = n/2 (2a+(n-1)b)
→ sn =n/2 (a+ Un)
Geometri → un = a.r pangkat n-1
→ sn = a.(r pangkat n-1) / r- 1 : bila r<1
→ sn = a(1-r pangkat n) / 1-r : bila r>1