(1 / 2 of 1-2) times (1 / 3 of 1-3) times (1 / 4 of 1-4) times. Times (1 / 2 of 1-2004)

(1 / 2 of 1-2) times (1 / 3 of 1-3) times (1 / 4 of 1-4) times. Times (1 / 2 of 1-2004)


(1 / 2 of 1-2) times (1 / 3 of 1-3) times (1 / 4 of 1-4) times. Times (1 / 2 of 1-2004)
=(1+1/2)x(1-1/2)x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4)x…… x(1+1/2004)x(1-1/2004)
=3/2x4/3x5/4x…… x2005/2004x1/2x2/3x3/4x…… x2003/2004
=2005/2x1/2004
=2005/4008