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kyak gini 0+1=1, 1+2=3, 3+3=6, 6+4=10, 10+5=15, 15+6=21 dan strusnya
2 3
1
Bawah 2A=1 -----> A=½
Tengah 3A+B=2 ----->B=½
Atas A+B+C=1 ----->C=0
Un=An²+Bn+C
Un=(½)n²+(½)n+(0)
Un=½(n²+n) --->Ini rumus carinya
U5=½(5²+5)=½(30)=15
U6=½(6²+6)=½(42)=21
U100=½(100²+100)=½(10100)=5050