If sum of the first 21 terms of the series _ x^ 1/2 x+ _ x^ 1/3 x+ _ x^ 1/4 x+ , where x 0 is 504, then x...

Question

If sum of the first 21 terms of the series _ x^ 1/2 x+ _ x^ 1/3 x+ _ x^ 1/4 x+ , where x > 0 is 504, then x is equal to

Accepted Answer

(D)

JEE Main 2021 Mathematics question