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  3. 3 for each of the following if the set and...

Question: 3 for each of the following if the set and...

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3. For each of the following, if the set and operation form a group, say so and state the identity element for that group. If the set and operation do not form a group, explain how you know. (a) The set a, b, c,d with Cayley table given to the right. (b) The set 7,21,49,63 under the operation of multiplication mod 70. (c) The non-zero real numbers under the operation a *b- . a cd d d d b c

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