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3 4
1
2A=1 --->A=1/2
3A+B=3 -->B=3/2
A+B+C=3 -->C=1
Un=An²+Bn+C
Un=½n²+3/2 n + 1
Un=½(n²+3n+2)
Un=½n(n+3)+1 --->Rumus pola Un