Example 6 State which of the following sets are finite or infinite (ii) {x : x ∈ N and x2 = 4} x2 = 4 x = ± √4 x = ± 2 Thus, x = 2, −2 But x is a natural number (1, 2, 3, 4, 5…) It cannot be a negative number.. Given set = {2}. Since the number of elements of set is countable Hence, it is finite.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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