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Mapel : MatematikaKelas : IX SMP
Bab : Barisan dan deret
Pembahasan :
Kelipatan 2 habis dibagi 5
10 , 20 , 30 , ... , 190
Un = 190
a + (n - 1)b = 190
10 + (n - 1)(20 - 10) = 190
10 + (n - 1)(10) = 190
10 + 10n - 10 = 190
10n = 190
n = 19
Sn = n/2(a + Un)
S19 = 19/2(10 + 190)
S19 = 19/2(200)
S19 = 1900