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a = 1
b = 2
Sn = n/2 (2 + (n-1)2)
Sn = n/2 (2 + 2n -2)
Sn = n/2 (2n)
Sn = n^2
Penyebut
a=2
b=2
Sn = n/2 (4 + (n-1)2)
Sn = n/2 (4 + 2n -2)
Sn = n/2(2n +2)
Sn = n^2 + n
Sn = n(n+1)
Sn Pembilang / Sn Penyebut = n^2 / n(n+1)
Jadi jawabanya = n / (n+1)