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# Geometric sequences C2 Watch

1. Hello,

I just need something clearing up for me regarding sequences.

In some questions - in the edexcel mixed exercise in book c2 chapter 7 from questions 12 -16. The value of a = 1 - when in other seemingly similar questions the value of a is also the same as the value of r....

I cant quite work out why its different when the questions kinda follow the same pattern...

This is the link for the solutions from chapter 7 and specifically the last few questions of the mixed exercise at the end so you can see what I am trying to explain...

https://0e90d90be05fe2865012661b731d...apter%2007.pdf

Hope you can help me!

Thanks
2. The a can be the same as r, it's just a coincidence
3. there is no connexion between a and r.

if they are the same it is a coincidence.
4. Remember a is the first number in the sequence whereas r is the common ratio (divide two consecutive terms)
5. I know but in question 15 for example I set a = to 1.05 the same as r because thats what I got when I wrote the sequence out and it seemed to follow the other questions I did.

But the answer was wrong and that was coz a = 1 in this case - I jsut didnt understand why and there are a few questions like that where I am not sure why a =1
6. But you start of with £1000, which you can simply to a = 1?
7. The 5% only applies after first year i.e. next year would be 1.05 etc
8. That simple??
9. Yes, you have over complicated it. But good on you that you are thinking deeply. I o Advanced Higher Maths in Scotland, similar to A Level in England and I greatly enjoy it. Best wishes
10. Thank you for your help!

I am enjoying it but just have to work extra hard because I dont have a maths brain :-(

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Updated: March 31, 2016
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