Question

Enumerati elementele multimitimilor:A={xIx apartine N<3^x< 81} D={x apartine N I x= 7 ori k +1,k< 7}

Answer 1

3^x< 81
3^x<3^4
x<4
A={0,1,2,3}

k<7  l x7
7k<49  l +1
7k+1<50
D={1,15,22,29,36,43}