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b = -9 - (-6) = -3
a = U5 - 4b = -6 - (-12) = 6
Ditanyakan :
Suku ke-10 (U10) ?
Jawab :
Un = a + (n-1) b
U10 = 6 + (10-1) (-3)
U10 = 6 + 9 . (-3)
U10 = -21