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a = 3
b = 2
Sn = 440
Maka,
Karena n harus positif, maka:
n = 20
Sehingga,
k = a+(n-1)b
k = 3+(20-1)2
k = 3 + (19 x 2)
k = 3 + 38
k = 41
b = 2
= 440
=
440 =
440 =
440 =
440 =
880 =
0 = -880
0 = -440
0 = (n+22)(n-20)
*n+22=0
n = -22 ( tidak mungkin karena min)
*n-20 = 0
n = 20