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The inverse element of $\omega ^2$ in the multiplicative catine group $\{1, \omega,\omega ^2\}$ where $\omega$ is the cube roots of unity, is :

\[(a)\;1 \quad (b)\;\omega \quad (c)\;\omega^2 \quad (d)\;\omega^3\]

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(b) $\omega$
answered Nov 7, 2013 by pady_1

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