Tentukan rumus suku ke-n untuk barisan bilangan berikut. a. 3,4,5,6,... b. 0,3,6,9,.. c. 9,14,19,14,... d. 2,6,18,54...

a. 3, 4 , 5, 6
U1 = 3 beda = 1
Un = 3 + (n-1) 1 = 3 + n - 1 = n+2

b. 0, 3, 6, 9
U1 = 0 beda = 3
Un = 0 + (n-1) 3 = 0 + 3n - 3 = 3n-3

c. 9, 14, 19, 14 ?? bukannya 24 ya
9, 14, 19, 24
U1 = 9 beda = 5
Un = 9 + (n-1) 5 = 9 + 5n - 5 = 5n+4

d. 2, 6, 18, 54
U1 = 2 rasio = 3
[tex]Un = 2 \times {3}^{n - 1} [/tex]