`[1/100-1^2].[1/100-(1/2)^2].[1/100-(1/3)^2]...[1/100-(1/20)^2]`
= `[1/100-1^2].[1/100-(1/2)^2].[1/100-(1/3)^2]...[1/100-(1/10)^2]...[1/100-(1/20)^2]`
= `[1/100-1^2].[1/100-(1/2)^2].[1/100-(1/3)^2]...[1/100-1/100]...[1/100-(1/20)^2]`
= `[1/100-1^2].[1/100-(1/2)^2].[1/100-(1/3)^2]...0...[1/100-(1/20)^2]`
= 0
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