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# Can anyone work out part 'd' of this arithmetic sequence question (Maths C1)? watch

1. Having trouble working part d out! Click picture below...

2. (Original post by Philip-flop)
Having trouble working part d out! Click picture below...

If you write down the first few terms of the sequence as , what do you notice?
3. (Original post by Zacken)
If you write down the first few terms of the sequence as , what do you notice?
1 + (1 - K) + (1 - 3K + 2K^2) + ....

They all start with 1?

Wow I really am unprepared for my exams this summer
4. (Original post by Philip-flop)
1 + (1 - K) + (1 - 3K + 2K^2) + ....

They all start with 1?

Wow I really am unprepared for my exams this summer
you might wanna sub your calculated value for k into that and see what sequence you come out with
5. (Original post by Philip-flop)
1 + (1 - K) + (1 - 3K + 2K^2) + ....

They all start with 1?

Wow I really am unprepared for my exams this summer
You're on the right track but you know that x3 (your 1 - 3k + 2k^2) is 1 so you can just write that as 1, to get it as 1 + (1-k) + 1 ... (and then what comes next, and after that etc, and how does this help you answer the question?)

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