=SIERREUR(INDEX(A$2:A$25;PETITE.VALEUR(SI($C$2:$C$25="Commercial";LIGNE(INDIRECT("1:"&LIGNES(A$2:A$25))));LIGNE(1:1)));"")
=SIERREUR(INDEX(A$2:A$25;EQUIV(PETITE.VALEUR(SI(C$2:C$25="Commercial";NB.SI(A$2:A$25;"<"&A$2:A$25));LIGNE(1:1));NB.SI(A$2:A$25;"<"&A$2:A$25);0));"")