Jee Main
Sequences And Series
JEE Main 2021 (Online) 20th July Evening Shift
MCQ+4 / -12021
If sum of the first 21 terms of the series \({\log _{{9^{1/2}}}}x + {\log _{{9^{1/3}}}}x + {\log _{{9^{1/4}}}}x + .......\), where x > 0 is 504, then x is equal to