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+2 +3 +4 ....
+1 +1
Sehingga rumus Un = 1 + 2 (n-1) + (n-1)(n-2)/2
= (4n - 2 + n² -3n + 2 )/ 2
= (n² + n) / 2
Sehingga
1. U10 = (10² + 10) / 2 = 55
2. Merupakan pola bilangan segitiga
3 = 2 (2+1)/2
6 = 3(3+1)/2
U10 = 10(10+1) /2 = 55
2. pola tersebut adalah pola segitiga