Consider sets A and B below
A = {x | 2<x ≤ 5 and x ∈ N }
and
B = {x|2<x ≤ 5}
a) Write a description of set A and set B.
b) Explain the difference between set A and set B.
c) Write set A in roster form.
d) Can set B be written in roster form? Explain your answer.
A cardinal number answers the question “How many?” An ordinal number describes the relative position that an element occupies. For example, Molly’s desk is the third desk from the aisle.
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