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3 6
3
bawah 2A=3--->A=3/2
tengah 3A+B=3 --->B=6/2-9/2=-3/2
atas A+B+C=5 ---->C=5-3/2+3/2=5
Un=An²+Bn+C
Un=3/2 n²-3/2n+5
Un=3/2 n(n-1)+5 --->Rumus Suku ke n
U51=3/2. 51(51-1)+5
U51=3/2. 51(50)+5
U51=3825 + 5
U51=3830
Jadi suku ke 51 adalah 3830