Question: 19) A commutative ring with unity element and without zero divisor is called a/an a. field. b. subfield. c. subring. d. integral domain. 20)

19) A commutative ring with unity element and without zero divisor is called a/an a. field. b. subfield. c. subring. d. integral domain. 20) Which of the following statement is FALSE? a. Z is a subring of 2Z. b. 2ZZ is a subring of Z. c. Q is a subring of R. d. Z is a subring of Q.

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