Răspunsuri

Cel mai inteligent răspuns!
2014-07-23T17:32:04+03:00
C₁₁ ^ 1 + C₁₁ ^2 + C₁₁ ^3 +......+ C₁₁ ^10

C₁₁ ^1= C₁₁ ^(11-1) = C₁₁ ^10= 10
C₁₁ ^2=C₁₁  ^(11-2)=  C₁₁^9 =9
C₁₁ ^3=C₁₁ ^(11-3)=C₁₁ ^8 =8
.................................................
C₁₁^10=C₁₁ ^(11-10)=C₁₁^1=1

S=10+9+8+....+1= (10+1)*10/2= 11*5 :11  (trebuiau 3 puncte)
1 5 1