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If (1+x)^(n) = sum(r=0)^(n) a(2) x^(r) ...

If `(1+x)^(n) = sum_(r=0)^(n) a_(2) x^(r) , b_(r) = 1 + a_(r)/(a_(r)-1)`
and `prod_(r=1)^(n) b_(r) = ((101)^(100))/(100!),` then the value of `n/20` is

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