Răspuns:
3
Explicație pas cu pas:
1+1/2=3/2 1-1/2=1/2
1+1/3=4/3 1-1/3=2/3
1+1/4=5/4 1-1/4=3/4
1+1/5=6/5 1-1/5=4/5
1+1/6=7/6 1-1/6=5/6
(3/2×4/3×5/4×6/5×7/6)--(1/2×2/3×3/4×4/5×5/6)=10/3
n×a pentru n= 3 are ca rezultat un nr.intreg
