If the sum of the first 20 terms of the series (7^ 1/2 )x+ (7^ 1/3 )x+ (7^ 1/4 )x+ is 460, then x is equal to...

Question

If the sum of the first 20 terms of the series (7^ 1/2 )x+ (7^ 1/3 )x+ (7^ 1/4 )x+ is 460, then x is equal to :

Accepted Answer

(D)

JEE Main 2020 Mathematics question