Question

Diketahui barisan geometri demgan suku ke 3 = 2 dan suku ke 7 = 32. Suku ke 10 barisan itu adalah?

Answer 1

U3 = ar^2 = 2
u7= ar^6 = 32

r^4 = 32/2 = 16
r = 2

ar^2 = 2
a x 2² = 2
a = 1/2

u10 = ar^9
        = 1/2 x 2^9
        = 1/2 x 512
        = 256