Inductie completa
n=1
1/(2+1)+1/(2+2)=1/3+1/4=(4+3)/3*4=7/12=amplifici cu 2=14/24>13/24
Presupui Pn adevarata.Verifici daca Pn=>Pn+1
Pn=1/(n+1)+1/(n+2)+...+1/2n>13/24 (A
Pn+1={1/n+1/(n+2)+...+1/2n}+1/(2n+2)>13/24
13/24+1/2(n+1)>13/24
Pn=> Pn+1 inegalitatea e adevarata