Posted by **Ashley Everette** on Thursday, April 15, 2010 at 3:48pm.

In the questions below determine the size (i.e. cardinality)

of the set.

• {x|x ∈ N, x2 < 10}

• P({a,b,c,d,e }) where P denotes the Power set

• A × B where A = {1, 2, 3, 4, 5} and B = {1, 2, 3}

• {x|x ∈ Z, 9x2 −1 = 0}

• A × B where A = {a, b, c} and B = ∅

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