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Que. If Im 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:
(i) Z23      (ii) Z29
(iii) Z31    (iv) Z33
a. (i) only
b. (i) and (ii) only
c. (i), (ii) and (iii) only
d. (i), (ii), (iii) and (iv)
Answer:(i), (ii) and (iii) only
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