Relations and Functions

Relations and Functions

Question

State which of the following sets are finite, which are infinite : 

(i) A = {x : x space space element of N,  and (x-1) (x - 2) = 0}

(ii)  { x : x space space element of N and x= 25}

(iii)  { x: xspace space element of space N, 2x-1  = 0}

(iv)  { x : x space space element of N, x is prime}

Answer

(i) finite
(ii) Finite
(iii) Finite
(iv) Infinite
(v)  Infinite

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