I have the following fraction: fraction

How can I use a line and cross off the 3, 2, and 1s in the numerator and denominator?

I need a line crossing off the 3s in the numerator and denominator - one line. Same goes for 2s and 1s. (not two separate lines in numerator and denominator).

  • Should this be done automatically? – user31729 May 9 '16 at 22:23
  • Have you looked at this answer? It seems to do what you want. – Jānis Lazovskis May 9 '16 at 22:26
  • @jlv i need to cross out individual numbers between the numerator and denominator – MCMastery May 9 '16 at 22:28

Simple with pst-node: define the numbers you want to cancel as nodes, and connect the corresponding nodes with a line:




\[ \begin{pspicture}
  \dfrac{7\cdot 6\cdot 5\cdot 4\cdot\Rnode{n3}{3}\cdot\Rnode{n2}{2}\cdot\Rnode{n1}{1}}%
  \psset{linewidth=0.3pt,  nodesep=-6pt}


enter image description here

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