i can't manage to do all 3 parts, the answer key given is (a) (n/6)(n+1)(2n+19)

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junior college 1 | H2 Maths
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junior college 1 H2 Maths

i can't manage to do all 3 parts, the answer key given is
(a) (n/6)(n+1)(2n+19)
(b) (n/3)(28n^2 -1)
(c) 3930
thank you!

Date Posted: 7 years ago

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Date Posted: 7 years ago

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Kelvin Kaung

7 years ago

Sorry this is incorrect. Below is correct

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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.

Date Posted: 7 years ago

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