Let p1, p2, p3 denote three distinct prime numbers, and set n = P1P2P3. Show that if a congruence class [an is not invertible, and is not equal to the zero congruence class [0]n, then [a]n must be a zero divisor in Zn.

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Let p1, P2, P3 denote three distinct prime numbers, and set
n = Pip2P3. Show that if a congruence class [a]n is not invertible, and is not
equal to the zero congruence class [0]n, then [a, must be a zero divisor in
Zn.
Transcribed Image Text:Let p1, P2, P3 denote three distinct prime numbers, and set n = Pip2P3. Show that if a congruence class [a]n is not invertible, and is not equal to the zero congruence class [0]n, then [a, must be a zero divisor in Zn.
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