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K= 353
SEMOGA MEMBANTUYAA
b = 2
Sn = (n/2)(2a+(n-1).b)
440 = (n/2)(6+(n-1).2)
440 = n(2+n)
0 = n² + 2n - 440
0 = (n+22)(n-20)
n = 20(ambil yang positif aja)
k = a+(n-1).b
k = 3+19.2
k = 41