All students from Edgecliff High School received a grade of "A" in English. No student in Edgecliff High School received a grade of "B" in History. Macquarie University only admits students if the student has received a Grade "A" in History.

Jenny: "I know someone who studied at Edgecliff High School, who is going to Macquarie University next year. Therefore, they must have received a Grade "A" in History and English.

Marcus: "I know someone who received a grade "B" in history, so they cannot have attended Edgecliff High School."