\(\left(1-\dfrac{1}{2}\right)\) \(\left(1-\dfrac{1}{3}\right)\) \(\left(1-\dfrac{1}{4}\right)\)
\(\left(\dfrac{2}{2}-\dfrac{1}{2}\right)\) \(\left(\dfrac{3}{3}-\dfrac{1}{3}\right)\) \(\left(\dfrac{4}{4}-\dfrac{1}{4}\right)\)
\(\dfrac{1}{2}\) . \(\dfrac{2}{3}\) . \(\dfrac{3}{4}\)
\(\dfrac{1}{4}\)
