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U3 = 4 (dikurang)
b.4 = 12
b = 12/4 = 3
mencari nilai a :
U3 = a + 2b
4 = a + 6
a = 4 - 6 = -2
U10 = a + 9b = -2 + 9(3) = 25
Sn = 1/2n (a+Un)
S10 = 5 (-2+25) = 5 (23) = 115
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