I know that Brilliant is a great way to learn mathematics. However, the 'O' level, an examination taken in Cambridge-affiliated schools worldwide, is taking place soon and I am taking it in October. Can Brilliant help me to brush up on my Mathematics for the examination?
more info: https://en.wikipedia.org/wiki/GCE Ordinary Level
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Sometimes, zero stands for no(or negative answers), and one stands for yes(or positive answers).
Knowing this, the answer is obviously 1.