1999*(1+1/2)*(1+1/3)*(1+1/4)*(1+1/5)*(1+1/6)*................*(1+1/1999)
=1999*(3/2)*(4/3)*(5/4)*(6/5)*........(1999/1998)*(2000/1999)
=1999*(2000/2)
=1999000
1999 * ( 1 + 1/2 ) * ( 1 + 1/3 ) * …… * ( 1 + 1/1999)
= 1999 * 3/2 * 4/3 * 5/4 * …… * 2000/1999
= 1999/2 * 2000
= 1999000
1999*3/2*3/4*4/5*5/6*.................*000/1999=1999*2000*/2=1999000
kai