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U7 = × 7 (7+1)
= × 7 (8)
= 28
3 9 18
6 9
3
2a = bawah
3b+c = tengah
a+b+c = atas
2a = 3 a = 3/2
3a+b = 6 3.3/2+B = 6 -----> b = 3/2
a+b+c = 3 3/2+3/2+C = 3 -----> c = 0
Rumus suku Un = an²+bn+c
= 3/2.n²+3/2.n+0
U7 = 3/2.7²+3/2.7+0
= 73,5+10,5+0
= 84