Question

Let ℚ be the set of all rational numbers and ℤ be the set of all integers. Which of the following is NOT an Abelian

group? (Where+ is an ordinary addition)

(a) (ℤ, +)

(b) (ℚ, +)

(c) 4 ; the permutation group of four symbols

(d) None of the above
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Answer 1

Answer:

d....................

Answer 2

Answer:

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