# Past Papers’ Solutions | Edexcel | AS & A level | Mathematics | Core Mathematics 1 (C1-6663A/01) | Year 2014 | January | Q#5

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**Question**

Given that for all positive integers n,

**a) **find the value of

**b) **Find the value of

**Solution**

**a. **

We are given that;

We are required to find .

Therefore, we substitute n=5;

**b. **

We are required to find .

We can find as follows;

Therefore ;

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