Calculation: (1-1 / 2) × (1-1 / 3) × (1-1 / 4) ×···× (1-208) × (1-209)

Calculation: (1-1 / 2) × (1-1 / 3) × (1-1 / 4) ×···× (1-208) × (1-209)

Calculation: (1-1 / 2) × (1-1 / 3) × (1-1 / 4) ×···× (1-208) × (1-209)
=1/2x2/3x3/4x..x2007/2008x2008/2009
=1/2009