I need help with 3(b)! It's under Summation. Thought I could apply the AP formul

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junior college 2 H2 Maths

I need help with 3(b)! It's under Summation. Thought I could apply the AP formula but didn't get the answer.

Date Posted: 6 years ago

Jack

6 years ago

Gahaha actually I need help with part (c) too D; but you can answer only part b first if you prefer

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Correct?

Date Posted: 6 years ago

Jack

6 years ago

Thanks!