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Which of the following is a singleton set ?A. The set of all the months in a year having exactly 30 days.B. The set of all the days in a week.C. The set of all the natural satellites of the earth in the solar system.D. The set of all the intersecting points of two parallel lines in a plane. |
Answer» Correct Answer - C (a) all months in a year having exactly 30 days are April, June, September and November. `:.` It is not a singleton set. (b) In a week, we have 7 days. `:.` It is not a singleton set. (c) The natural satellite of the earth in the solar system is moon. `:.` It is singleton set. (d) Parallel lines in a plane never intersect. `:.` The set of all intersecting points of two parallel lines in a plane is not a singleton set. Hence, the correct option is (c). |
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