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OpenStudy (anonymous):

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).

OpenStudy (anonymous):

upside down u means intersection, so 4 has to be whatever number all those functions have in common

OpenStudy (anonymous):

ok thank you

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