Relations and Functions

Relations and Functions

Question

Which of the following are examples of a null/empty set?

(a) A = {x :x ∊ N, 1 < x < 2}

 (b) B = {x : x ∊ N, x < 1 or x > 3}

(c) C = {x : x ∊ N,x < 1 and x > 3}

(d) D = {x : x ∊ N, x ≤ 36}

(e) E = {x : x is an even prime number greater than 5}

Answer

(a),     (c)  and    (e)

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