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However, the exam papers of the GCSE sometimes had a choice of questions, designed for the more able and the less able candidates. When introduced the GCSEs were graded from A to G, with a C being set as roughly equivalent to an O-Level Grade C or a CSE Grade 1 and thus achievable by roughly the top 25% of each cohort.
The branch of mathematics deals with the properties and relationships of numbers, especially positive integers. Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions. German mathematician Carl Friedrich Gauss said, "Mathematics is the queen of the sciences—and number theory ...
Islam [a] is an Abrahamic monotheistic religion based on the Quran, [9] and the teachings of Muhammad. [10] Adherents of Islam are called Muslims, who are estimated to number 1.9 billion worldwide as of 2020 and are the world's second-largest religious population after Christians.