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Verified answer
JawabSn = 3n^2 - n
A.
suku pertama = 3 - 1 = 2
beda = 2(3)= 6
B. Un = a + (n-1)n
Un = 6n - 4
C.s10= 300- 10 = 290
D> U10= a +9b = 2 +9(6)= 56