Răspunsuri

  • Utilizator Brainly
2014-09-08T18:10:18+03:00
A = { x € N | 1+2+3+...+10 < n < 2+3+...+11}
A = { x € N | (10*11:2 )< n < [(11+2)(11-2+1):2]}
A = { x € N | 55 < n < 65}

=> propozitia "64 € A" este falsa;