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

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in Mathematics by (50.4k points) 1 flag

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

(1) 746/21 

(2) 71/2 

(3) e2 

(4) 72

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1 Answer

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The correct option is (4) 72.

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