Răspuns :
[tex]\displaystyle\sf\\\underline{SUBIECTUL~1}:\\5.~cel~mai~mic~numar~prim~este~\boxed{\sf 2}.\\6.~diferenta~numerelor~101~si~101~este~\boxed{\sf 0}.\\\underline{SUBIECTUL~2}:\\1.~a)\boxed{\sf~\mathcal{D}_{20}=\left\{1,2,4,5,10,20\right\}}.\\1.~b)~multiplii~numarului~5~cuprinsi~intre~1~si~21~sunt:\boxed{\sf\left\{5,10,15,20\right\}}.[/tex]