Sagot :
next term is 9. Look:
729 x (1/3) = 243
243 x (1/3) = 81
81 x (1/3) = 27
27 x 1/3) = 9
729 x (1/3) = 243
243 x (1/3) = 81
81 x (1/3) = 27
27 x 1/3) = 9
It is nine because you times it by a third of the previous number