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Un = 44
S3 = 3/2 (U1+Un) = 15
3/2 ( U1+44) = 15
U1+44 = 10
U1 = 10-44
U1 = -34
suku tengah = 1/2 (U1+Un)
1/2 ( -34 + 44)
1/2 ( 10) = 5