Find the cardinal number of each of the following sets. Assume the pattern continues in each part:
a. {9, 10, 11,…., 99}
b. {2, 4, 6, 8, , 2002}
c. {x2 _ x = 1, 3, 5, 7, , 99}
d. {x |x = x + 1, x Є N}
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