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yaitu;
a=1 ( suku pertama )
b=2 (beda coba liat 1 ke 3 lalu seterusnya pasti bedanya 2)
n= 99 (suku)
Rumus
Sn= n/2{2a+(n-1)b}
Sn= 99/2 {2 x 1 +(99-1) 2}
Sn= 99/2 {2+98 x 2}
Sn= 99/2 { 2+196}
Sn= 99/2 x 198
Sn= 9.801
jadi jumlanya 9.801