Question

fie multimileA={x E N* / este cifra para} ; B = {y E N / 3Y +1 < 10 } ; si C = { z E N / 3 z 2 + 1 <_ 49}. Determinati multimile A, B, C specificand si cardinalul lor.

Answer 1

A={x £ N*,este cifra para}; A={2,4,6,8}=>C=4; B={y £ N,3y+1<10}; 3y+1<10=>y=0,1,2; B={0,1,2}=>C=3; C={z £ N,3+z+2+1≤49; 6+z≤49|-6; z≤43=>C={0,1,2,...,43}=>C=43