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3⁻³ + 3²⁽⁻²⁾
3⁻³ +3⁻⁴
1/3³ + 1/3⁴
1/27 + 1/81
3/81 + 1/81
4/81 (C)
28. 3⁻² + 2⁻³
1/3² + 1/2³
1/9 + 1/8
8/72 + 9/72
17/72 (B)