2026 CCHY P1 Q3

2026 CCHY P1 Q3

Secondary 4
5 marks

The first three terms, in ascending powers of \(x\), in the expansion of \((1+x)(1-5x)^n\) are \(1-44x+px^2\), where \(p\) and \(n\) are constants.

Find the value of \(p\) and of \(n\).[5]

Solution:

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Answer:\(p=855,n=9\).

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