(-1+1/100)x(-1+1/101)x.x(-1+1/2006)=?
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(-1+1/100)x(-1+1/101)x.x(-1+1/2006)=?
(-1+1/100)x(-1+1/101)x.x(-1+1/2006)=?
(-1+1/100)x(-1+1/101)x.x(-1+1/2006)=?
=(-99/100)*(-100/101)*(-101/102)*.*(-2005/2006)
=-99/2006
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