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Nulisnya mungkin bisa lebih dirapihin lagi, biar lebih jelas.((k+1)/k) + ((k+3)/k) + ((k+5)/k) + ...
= (1 + 1/k) + (1 + 3/k) + (1 + 5/k) + ...
= (1 + 1/k) + (1 + 1/k + 2/k) + (1 + 1/k + 2/k + 2/k) + ...
a = 1 + 1/k
b = 2/k
Sn = (n/2)(2a + (n - 1)b)
= (n/2)(2(1 + 1/k) + (n - 1)(2/k))
= (n/2)(2 + 2/k + 2n/k - 2/k)
= (n/2)(2 + 2n/k)
= n(1 + n/k)
= n((k + n)/k)
= (n/k)(k + n)