Question

1. Jika suku ke-n, S(n) = 1/6 n (n+1) (2n+1) maka S(8) = ...
2. Dari barisan bilangan Fibonacci : 1,1,2,3,5,8,13, ... Suku ke 15 adalah??

Answer 1

1. S(n) = 1/6 x n x (n + 1) x (2n + 1)
S(8) = 1/6 x 8 x (8 + 1) x (2(8) + 1)
S(8) = 8/6 x 9 x (16 + 1)
S(8) = 8/2 x 3 x 17
S(8) = 4 x 3 x 17
S(8) = 12 x 17
S(8) = 204

sori yg nomer 2 gak ngerti