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: x 100
: x 100
: 50.5 x 100
: 5.050
Kalo bingung tanya aja!
Sn= jumlah pertama sampai suku ke-n
a= angka awal/pertama
b= perbedaan/selisih bilangan 1 dan 2
Misal
S₄= 4/2 ( 2.1 + (4-1)1)
S₄= 2 ( 2 + 3)
S₄= 2 (5) = 10
bukti : 1+2+3+4 = 10 (hasilnya sama)