Question

aflati cardinalul multimii A={x/x€|N,x=a la puterea b.,a,b€{1234} }

Answer 1

 [tex]Inseamna \,ca\,a\in\{1;2;3;4\}\;\;si\;\;b\in\{1;2;3;4\}\\ \Rightarrow\;A=\{1^1; 1^2; 1^3; 1^4; 2^1; 2^2; 2^3; 2^4; 3^1; 3^2; 3^3; 3^4; 4^1; 4^2; 4^3; 4^4\}\\ deci:\;\;\;card.\,A=4\cdot4=16[/tex]