Question 1040686: Find the cardinal number of each of the following sets.
a. {100, 101, 102, 103,...120}
c. {x|x=k^2, k=1, 2, 3,...67}
b. { 100, 102, 104,...300}
d. {(1, 2), (100, 101), (0, 104)}
Answer by ikleyn(52787)   (Show Source):
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Find the cardinal number of each of the following sets.
Cardinal number of a finite set is the number of elements in the set.
a. {100, 101, 102, 103,...120} This set contains 21 element. ---> The cardinal number is 21.
c. {x|x=k^2, k=1, 2, 3,...67} This set contains 67 elements. ---> The cardinal number is . . . what?
b. { 100, 102, 104,...300} This set contains 101 elements. ---> The cardinal number is . . . what?
d. {(1, 2), (100, 101), (0, 104)} There are 4 (four) elements in this set. Hence, the cardinal number is 4.
(the elements of this set are pairs of numbers)
Your list goes in the strange order: a), c), b), d).
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