F5. Here is :1 supposed \"proof1 that all whiteboard markers have the same color. Let Flirt] denote the proposition that all markers in an},r set of 11 markers have the same color. lllllearlj,r F'{l]l is true. \"Sow assume PHI} is true and take a set of R: + 1 markers. Then the rst I: markers have the same color by the inductive hypothesis. and so do the last I: markers. So. all I; + 1 markers must he of the some color! 'What is wrong with this \"proof"