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3 6
3
bawah : 2A=3 ---->A=3/2
tengah : 3A+B=3 ---->B=-3/2
atas : A+B+C=2 ---->C=4/2
Un=An²+Bn+C
Un=(3/2)n²+(-3/2)n+(4/2)
Un=1/2(3n²-3n+4) ----->Rumua suku ke n
U500=1/2(3.500²-3.500+4)=374252