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Find the least element of each of the following sets, if there is one. If there is no least element, enter none. a. {nN:n221}. b.

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Find the least element of each of the following sets, if there is one. If there is no least element, enter "none". a. {nN:n221}. b. {nN:n23N}. c. {n2+5:nN}. d. {nN:n=k2+5 for some kN}

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