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2 3 4
1 1
2A=1 ----->A=1/2
3A+B=2 ----> B=1/2
A+B+C=7----->C=12/2
Un=An²+Bn+C
Un=(1/2)n²+(1/2)n+(12/2)
Un=(n²+n+12)/2 ---> Rumus Un
U23=(23²+23+12)/2=564/2=282