JEE Math Practice Question
If the sum of the first 20 terms of the series $${\log _{\left( {{7^{1/2}}} \right)}}x + {\log _{\left( {{7^{1/3}}} \right)}}x + {\log _{\left( {{7^{1/4}}} \right)}}x + ...$$ is 460, then x is equal to :
- A.e2
- B.71/2
- C.72
- D.746/21
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