Question 1 Explain why the following are not groups. (i) (N,+). (ii) (R,.). (iii) (Z,-) where - is subtraction.

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A: h). n = 81     p = 0.10

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A: Explanation of the answer is as follows

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Q: What is the number of months?

A: 12

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A: Please see the answer below.

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