1-1/2=1/2
1-1/3=2/3
1-1/4=3/4
1-1/5=4/5
...........
1-1/1999=1998/1999
1-1/2000=1999/2000
Atunci expresia devine:
(1/2) x (2/3) x (3/4) x (4/5) x .......x (1998/1999) x (1999/2000)
Se simplifica primul numitor (2) cu cel de=al doilea numarator (2), al doilea numitor (3) cu cel de-al treilea numarator (3).....penultimul numitor (1999) cu ultimul numarator (1999) si expresia ramane 1/2000
