(Describing a Set)

1 Methods of describing a set: 

2. Cardinal number of a Set.

     Number of elements that contain in a set.

3. Exercise:

Q. List the elements (if necessary) then write the Cardinal number of the following sets.

 a) X = {prime number less than 13}

 b) Y = {factors of 64}

 c) Z = {letters in the word "COLLECTION"}

 d) A = {x: -1 ≤ x ≤ 5, x ∈ W}

e) B = {h, i, r, a}

  f) P = {natural number less than 1}