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2 4 6 8
2 2 2
2a = 2
a = 1
3a+b = 2
3.1+b = 2
b = 2-3 = -1
a+b+c = 3
1+(-1)+c = 3
1-1+c = 3
c = 3
Rumus suku Un = an²+bn+c
= 1.n²+(-1).n+3
U16 = 1.16²+(-1).16+3
= 256-16+3
= 243 (b)