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Category: Set Theory

An-analyst-was-hired-to-survey-20-students-He-reported-that-6-eat-eba-5-eat-amala-and-7-eat-semovita-9-eat-eba-or-amala-12-amala-or-semovita-and-9-eba-or-semovita-3-eat-all-the-three-food-and-10-

Question Number 10000 by Tawakalitu ayo mi last updated on 20/Jan/17 Ananalystwashiredtosurvey20students.Hereportedthat6eateba,5eatamalaand7eatsemovita.9eatebaoramala,12amalaorsemovitaand9ebaorsemovita.3eatallthethreefoodand10eatnone.Afteracarefulanalysisofthesefindings,theanalystwasfired.$$\mathrm{why}\:??? \

Prove-that-If-A-B-and-C-are-subset-of-the-same-universal-set-then-A-B-A-C-A-B-C-

Question Number 7440 by Tawakalitu. last updated on 29/Aug/16 ProvethatIfA,BandCaresubsetofthesameuniversalsetthen(AB)(AC)=A(BC) Commented by Yozzia last updated on 29/Aug/16 $${Let}\:{A}=\left\{\mathrm{1},\mathrm{2},\mathrm{3},\mathrm{4}\right\},\:{B}=\left\{\mathrm{2},\mathrm{3},\mathrm{4},\mathrm{5}\right\},\:{C}=\left\{\mathrm{3},\mathrm{4},\mathrm{5},\mathrm{6}\right\}. \