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UGC NET CSE | December 2004 | Part 2 | Question: 5

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If $I_m$ denotes the set of integers modulo $m$, then the following are fields with respect to the operations of addition modulo $m$ and multiplication modulo $m$ :

  1. $Z_{23}$
  2. $Z_{29}$
  3. $Z_{31}$
  4. $Z_{33}$
  1. (i) only
  2. (i) and (ii) only
  3. (i), (ii) and (iii) only
  4. (i), (ii), (iii) and (iv)
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