<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Yes, I have completed all the previous challenges, I have completed most 3 times, and some 2 times. For the most part with all the previous challenges I never had too much trouble. The only other problems that gave me a decent amount of trouble were the permutation function, and computing natural logarithm of some number.<br><br><br><br><br></td></tr></table><br>