1 / 9 2 / 27 1 / 27 () what do you fill in the brackets? It's a question for civil servants

1 / 9 2 / 27 1 / 27 () what do you fill in the brackets? It's a question for civil servants

4/243
Reason: 2 / 27 = (1 + 1) / (9 * 3)
1/27=(1+2)/(9*9)
(1+3)/(9*27)=4/243