Question

D = {x|x is a whole number}
E = {x|x is a perfect square between 1 and 9}
F = {x|x is an even number greater than or equal to 2 and less than 9}

The number 4 is D ∩ (E ∩ F).
True or false?

Answer 1

First pick all of the perfect squares between 1 and 9 that are even. Then take all of the whole numbers from that.

Note every perfect square between 1 and 9 is a whole number

Answer 2

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