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4 9
5
bawah : 2A=5 --->A=5/2
tengah: 3A+B=4 --->B=8/2-15/2=-7/2
atas : A+B+C=2 --->C=4/2-5/2+7/2=6/2=3
Un=An²+Bn+C
Un=5/2 n² -7/2 n + 3
Un=½n(5n-7)+3 --->Rumus suku ke n
U10=½.10(5.10-7)+3=5(43)+3=218
U100=½.100(5.100-7)+3=50(493)+3=24653
U5=½.5(5.5-7)+3=2,5(18)+3=48