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[" Let "A,B,C" and "D" be four non empty...

[" Let "A,B,C" and "D" be four non empty sets.The contra positive statement of "If "A" ,"],[" Difen "A sube C^(*)" is "],[" a.If "A!=C" then "A!in BORB!=0],[" b."" if "A sube C" then "A sube BANDB sube C],[" c.if "A sube C" then "A sub BORD sube B],[" d.""if "A sube C" then "A sub BANDB sube C]

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