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# Tough series question (well for me anyway! [FP1]) Watch

1. See the attachment .

Stuck on part b).

Thanks
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2. (Original post by marek35)
See the attachment .

Stuck on part b).

Thanks
did you get to this stage?

3. Yeah I did i simplified that to-> 1/4n(n+1) (n^2+n+2)= 4/3 n (n+1)(2n+1).

Then I didnt know what to do after that

cheers
4. (Original post by Pheylan)
did you get to this stage?

Yeah I did i simplified that to-> 1/4n(n+1) (n^2+n+2)= 4/3 n (n+1)(2n+1).

Then I didnt know what to do after that

cheers
5. (Original post by marek35)
Yeah I did i simplified that to-> 1/4n(n+1) (n^2+n+2)= 4/3 n (n+1)(2n+1).

Then I didnt know what to do after that

cheers
assuming your values of a, b, c and k are right

get rid of the fractions (no one likes a fraction):

take out a factor of n(n+1):

simplify:

can you finish it off?
6. (Original post by Pheylan)
assuming your values of a, b, c and k are right

get rid of the fractions (no one likes a fraction):

take out a factor of n(n+1):

simplify:

can you finish it off?
Yeah done it solved it and got n=10

cheers

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