Gaynor

Come valuti 5C2 + 5C1? Risposta: #5C2+5C1=15# Spiegazione: #5C2+5C1=(5!)/((5-2)!2!)+(5!)/((5-1)!1!)# #=(5*4*3!)/(3!2!)+(5*4!)/(4!1!)# #=(5*4*cancel3!)/(cancel3!2!)+(5*cancel4!)/(cancel4!1!)# #=(5*4)/(2!)+(5)/(1!)# #=(5*4)/2+(5)/1# #=10+5# #15# Buona giornata dalle Filippine ….