Răspuns:
76
Explicație pas cu pas:
trebuie sa cunosti formuelele, atata tot.
C(8,5)= 8!/5!*3!=1*2*...*8/1*2*..*5*1*2*3= 6*7*8/1*2*3=7*8=56
A(5,2)=5!/2!*3!=1*2*...*5/1*2*3=4*5=20
Asadar, C(8,5)+A(5,2)=56+20=76
C(n,k)= n!/k!*(n-k)!
A(n,k)=n!/(n-k)!
n!=1*2*3*...*n
