Sequences And Series

If the sum of the series \(\frac{1}{1 \cdot(1+\mathrm{d})}+\frac{1}{(1+\mathrm{d})(1+2 \mathrm{~d})}+\ldots+\frac{1}{(1+9 \mathrm{~d})(1+10 \mathrm{~d})}\) is equal to 5, then \(50 \mathrm{~d}\) is equal to :