Question

1)Numarul elementelor multimii A={x apartine lui N stelat /2(2x-1) mai mic decat 10-x} 2) Fie multimea G={l;e;g;o}. Sa se calculeze numarul n=(-1)cardG

Answer 1

1)
2(2x-1)<10-x <=> 4x-2<10-x <=> 5x<12 <=> x< 12/5=2+2/5<3. => x apartine {1;2}. => A={1;2}, deci A are 2 elemente.

2)
G are 4 elemente. => cardG=4. => n=(-1)cardG=-4.