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b = -8 - (-10 1/2) = -16/2 + 21/2 = 5/2
Jadi, Suku ke-10 :
U10 = a + 9b
U10 = -16/2 + 9(5/2)
U10 = -21/2 + 45/2
U10 = 24/2
U10 = 12
2. a = 1/5k
b = 2/5k - 1/5k = 1/5k
Jadi, Suku ke-10 :
U10 = a + 9b
U10 = 1/5k + 9(1/5k)
U10 = 1/5k + 9/5k
U10 = 10/5k
U10 = 2k