jumlah bilangan kelipatan 4 dan 6 antara 100 dan 200 adapah

Un = a + (n - 1)b

Kelipatan 4
196 = 104 + (n - 1)4
196 = 104 + 4n - 4
196 = 100 + 4n
96 = 4n
24 = n

S24 = 24 / 2 (2(104) + 23(4))
S24 = 12 (208 + 92)
S24 = 3.600

Kelipatan 6
192 = 102 + (n - 1)6
192 = 102 + 6n - 6
192 = 96 + 6n
96 = 6n
16 = n

S16 = 16 / 2 (2(102) + 15(6))
S16 = 8 (204 + 90)
S16 = 2.352