\(\left(\frac{1}{2}-1\right):\left(\frac{1}{3}-1\right):...:\left(\frac{1}{50}-1\right)\)
\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+..+\frac{1}{98.99.100}\)
\(\left(1-\frac{1}{2^2}\right).\left(1-\frac{1}{3^2}\right).\left(1-\frac{1}{4^2}\right)....\left(1-\frac{1}{10^2}\right)\)
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