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secondary 3 | A Maths
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Luo Ruixiang
Luo Ruixiang

secondary 3 chevron_right A Maths

Can someone help me solve question 2?

Date Posted: 5 years ago
Views: 394

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Tan Guo Xiang
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Vera Lee Man Er
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For part i, you need to use cover up rule.
2/n(n+1)(n+2) = A/n + B/(n+1) + C/(n+2)
By cover up rule, A= 2/1(2) = 1
B = 2/(-1)(1) = -2
C = 2/(-2)(-1) = 1
Hence, answer is 1/n - 2/n+1 + 1/n+2

For part ii, refer to picture. You need to use summation