An examination had ten multiple choice questions; labelled Q1 to Q10 respectively. Each question had four answer options — A, B, C and D — of which one and only one was the correct answer. For each correct answer, the candidate obtained 1 mark. There were no negative marks for wrong answers. The answer chosen by six candidates named Om, Pavan, Qadir, Rakesh, Simranjeet and Tracey to each of the ten questions and the total mark obtained by each of them are shown in the table (answers to Q1–Q10; total marks): Om: D B C B C C B C A C; 2 | Pavan: D B A B B D A C B D; 5 | Qadir: A A A C C D B D D A; 7 | Rakesh: A C D A B C A C B C; 3 | Simranjeet: D B A B C C A D B A; 7 | Tracey: A C B B B D B C D C; 2