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Which of the following is true ?
(A) Every subset of a regular set is regular
(B) Every finite subset of non-regular set is regular
(C) The union of two non-regular set is not regular
(D) Infinite union of finite set is regular

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Which of the following is true ?
(A) Every subset of a regular set is regular
(B) Every finite subset of non-regular set is regular
(C) The union of two non-regular set is not regular
(D) Infinite union of finite set is regular

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Which of the following is true ?
(A) Every subset of a regular set is regular
(B) Every finite subset of non-regular set is regular
(C) The union of two non-regular set is not regular
(D) Infinite union of finite set is regular