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3 6 10
3 4
1
bawah: 2A=1 --->A=½
tengah: 3A+B=3 --->B=6/2-3/2= 3/2
atas: A+B+C=3 ---->C=6/2-3/2-⅓=2/2=1
Un=An²+Bn+C
Un=½n²+3/2 n + 1
Un=½n(n+3)+1 ----> Suku ke n
U10=½.10(10+3)+1=5×13+1=65+1=66
U100=½.100(100+3)+1=50×103+1=5151