suku ke -9 barisan bil 32,16,8,4... adalah

nilai a = 32
nilai r = 16/32 = 8/16 = 4/8 = 1/2

Ditanya U9

Jawaban

[tex]u9 = a \: r^{9 - 1} \\ u9 = 32 \times ( \frac{1}{2})^{8} \\ u9 = \frac{32}{ {2}^{8} } \\ u9 = \frac{32}{256} \\ u9 = \frac{1}{8} [/tex]
Jadi U9 = 1/8