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8, 11, 14,...
U1=a= 8
b = U2 - U1 = 11 - 8 = 3
Dit : S8?
Jawab :
Sn = n/2 (2a + (n-1)b)
S8 = 8/2 (2.8 + 7.3)
S8 = 4 (16+21)
S8 = 4 (37)
S8 = 148 kursi