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\(\sum\limits_{m = 1}^\infty \sum\limits_{n =1}^\infty \frac{m^2n}{3^m(n.3^m + m.3^n)}=\)

a. 16/9

b. 9/16 

 c. 1

d. none of these

1 Answer

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by (56.4k points)
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Best answer

Correct option is d. none of these

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