Hitunglah jumlah deret 3+8+13+….+93


A = 3, b = 5, Un = a + (n-1)b, 93 = 3 + (n-1) 5, 18 = n – 1, n = 19, Sn = n (a + Un) / 2, Sn = 19 (96)/2, Sn = 912