Exam-Style Question on Combinations
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 155. This question is similar to one that appeared on a GCSE Higher paper (specimen) for 2017. The use of a calculator is allowed.
Students in Year 10 at Riverdale High School can choose two different courses for their Friday afternoon elective lessons. Their two choices must be from two different school departments.
How many different ways are there of choosing two courses?
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