ProofWJEC Core 4A Level Maths past paper questions on the topic of Proof by Contradiction.WJEC C4 June 2005 Q10WJEC C4 June 2006 Q11WJEC C4 June 2007 Q10WJEC C4 June 2008 Q10WJEC C4 June 2009 Q10WJEC C4 June 2010 Q10WJEC C4 June 2011 Q10WJEC C4 June 2012 Q10WJEC C4 June 2013 Q10WJEC C4 June 2014 Q10WJEC C4 June 2015 Q10