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7 11
4
2A=4 --->A=4/2=2
3A+B=7 ---->B=7-6=1
A+B+C=3 ----->C=3-2-1=0
Un=An²+Bn+C
Un=2n²+n+0
Un=n(2n+1) ---> Rumus Pola ke n
U5=5(2.5+1)=5(11)=55
U10=10(2.10+1)=10(21)=210