Kelvin Kaung's answer to stephanie's Junior College 1 H2 Maths question.

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Kelvin Kaung
Kelvin Kaung's answer
7 answers (Tutor Details)
Abit messy but hope it helps. You need to break the equation up and you need to know the formula for sum of arithmetic progression. If you don't know what that is you gotta revise and check your text book.