Answer: 243, 729
Explanation:
We can see that the pattern is each number is multiplied by 3.
1 x 3 = 3
3 x 3 = 9
9 x 3 = 27
27 x 3 = 81
This means that to continue, we'll need to multiply 81 by 3, and multiply the product of that by 3.
81 x 3 = 243
243 x 3 = 729
This means that 243 and 729 is our final answer.