Simplify the Numerical Expression $\left( \frac { 2 ^ { - 1 } } { 7 ^ { - 2 } } \right) ^ { - 1 }$

question 255

Short Answer

Simplify the numerical expression. $\left( \frac { 2 ^ { - 1 } } { 7 ^ { - 2 } } \right) ^ { - 1 }$ Please enter your answer as a fraction.

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Definitions:

Carbon

A chemical element with symbol C and atomic number 6, essential to all known life and the basis for organic chemistry.

Pyrimidine

A nitrogen-containing heterocyclic aromatic compound, similar to benzene and pyridine, but with two nitrogen atoms in the ring.

Aromatic

Refers to organic compounds containing one or more benzene rings or similar ring structures, characterized by their stability and unique chemical properties.

Antiaromatic

Compounds that have conjugated pi systems but do not obey Huckel's rule, leading to instability.