Tentukan rumus suku ke-n dari barisan berikut!
a. 7, 11, 15, 19, .......
Jawab :
a = 7 b = 4
a - b = 7 - 4 = 3
Un = 4n + 3
b. 7, 3, -1, -5, .......
Jawab :
a = 7 b = -4
a - b = 7 - (-4) = 11
Un = -4n + 11
c. -4, -1, 2, 5, .......
Jawab :
a = -4 b = 3
a - b = -4 - 3 = -7
Un = 3n - 7
d. -1/81, 1/27, -1/9, 1/3, ......
Jawab :
a = -1/81 b = -1/3
a - b = -1/81 - (-1/3) = 26/81
Un = -1/3n + 26/81
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