(1-1 / 2) x (1-1 / 3) x (1-1 / 4) X... x (1-1 / 999) x (1-1 / 1000): 2000-1990 + 1980-1970 +... + 20-10 calculation

(2000-1990+1980-1970+...+20-10)/[(1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/999)x(1-1/1000)]
=(10+10+10+...+10)/(1/2x2/3x3/4x.x998/999x999/1000)
=(10x100)/(1/1000)
=1000x1000
=1000000

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