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= \frac{1}{ 3^{3} } + \frac{1}{ 9^{2} }
= \frac{1}{27} + \frac{1}{81}
= (C)
2.
= \frac{1}{ 3^{3} } + \frac{1}{ 2^{3} }
= \frac{1}{9.3} + \frac{1}{8}
=