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# FP1 Series Help watch

1. Hi I would need help with part 2 of this question, my answer looks quite unrealistic
Thanks 🙏🏼
2. (Original post by Amarante)
Hi I would need help with part 2 of this question, my answer looks quite unrealistic
Thanks 🙏🏼
3. (Original post by Zacken)

As I said, looks unrealistic, I can't spot the mistake and I'm not sure if the application of the formula is correct when r is denominator
4. (Original post by Amarante)

As I said, looks unrealistic, I can't spot the mistake and I'm not sure if the application of the formula is correct when r is denominator
That's not right. You should apply the method of differences for
5. you cannot apply the formula for summation of x if it says 1/x
instead put in numbers and see how the terms cancel.
6. (Original post by the bear)
you cannot apply the formula for summation of x if it says 1/x
instead put in numbers and see how the terms cancel.
I'm lost, do I just substitute n when r is denominator?
7. you start off with r = 1, then 2, then 3, then 4, then 5,... then go to the end where r is n -1 , and finally n.

you should look for a pattern of cancellations.

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