Tentukan rumus suku ke-n dan suku ke-10 dari barisan bilangan di bawah ini! a)1, 4, 16, 24, ... b)5, 10, 20, 40, ... c)9, 27, 81, 243, .... d)81, 27, 9, 3, ...
subebe
A. Un = 1 x (4)^ (n-1) U10 = 1 x 4^9 = 262.144 b. Un = 5 x (2)^ (n-1) U10 = 5 x 2^9 = 2.560 c. un = 9 x (3)^(n-1) U10 = 9 x 3^9 = 177.147 d. Un = 81 x (1/3)^(n-1) U10 = 81 x (1/3)^9 =0,00411
U10 = 1 x 4^9 = 262.144
b. Un = 5 x (2)^ (n-1)
U10 = 5 x 2^9 = 2.560
c. un = 9 x (3)^(n-1)
U10 = 9 x 3^9 = 177.147
d. Un = 81 x (1/3)^(n-1)
U10 = 81 x (1/3)^9 =0,00411