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a = 3
b = 2
Sn = 1763
Sn = n ( 2a + (n-1)b) / 2
1763 = n ( 6 + (n-1)2 / 2
1763 = n ( 3 + n -1)
2n + n² = 1763
dengan rumus abc, didapat
n = -43 n = 41
A) banyak suku = 41
Sn = n (a + Un) / 2
1763 = 41 (3 + Un) / 2
3526 = 41 (3 + Un)
86 = 3 + Un
Un = 83
b) Suku terakhir = 83