81 Each number is 3 x the previous number. So, 3 x 27 = 81.
-243
The next number is 243, because 81x3=243.
45
81
Each number is one third of the previous number, the next number in the series would be 3
Next number= 27 X 3 = 81.
Each number is 1/3 the value of the one to the left. The next number in the series is... 3.
If you mean: 1 3 9 27 81 then it is 3*81 = 243
81 Each number is 3 x the previous number. So, 3 x 27 = 81.
For each term, multiply the previous by -3. So, 27*-3=-81. -81 is the next term.
243
-243
243
9 243 - 81 = 162 81 - 27 = 54 162 = 54 * 3 54 = 18 * 3 27 - 18 = 9
It is 3 times 81 = 243
The next number is 243, because 81x3=243.