JEE Main 202120 Jul, Evening shiftMathematicsEasySequence and Series179× since 2002If sum of the first 21 terms of the series log91/2x+log91/3x+log91/4x+.......{\log _{{9^{1/2}}}}x + {\log _{{9^{1/3}}}}x + {\log _{{9^{1/4}}}}x + .......log91/2x+log91/3x+log91/4x+......., where x > 0 is 504, then x is equal toAOption A. 243BOption B. 9COption C. 7DOption D. 81CheckSkip · show solution