Find the cardinal number of the following sets:

(i) A = {1, 2, 3, 4, 5, 7, 9, 11}
(ii) M = {p,q,r,s,t,u}

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Solution

(i) Set A contains 8 elements. So, its cardinal number is 8.
(ii) Set M contains 6 elements. So, its cardinal number is 6.

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Find the cardinal number of the following sets :

(i) $A_{1} = {- 2, - 1, 1, 3, 5}$

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(iii) $A_{3} = {p : p \in W a n d 2 p - 3 < 8}$

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A = {2, 3, 6, 7}

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If A = {2, 3, 5, 7}, then the cardinal number of set A is 5.

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