30. Find the cardinal number of the following sets
(i) A = The set of all even natural numbers less than 20
(ii) D= {x: x=3n+2, n E W, x < 15}
(iii) C = {x: x is a perfect cube, 1 < x < 64}
(iv) B = the set of odd whole numbers less than 9
(v) P = {x : x = 1/2n, n E W , x <_ 5}
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