# Thread: Help with Sequencesa and summations.

1. ## Help with Sequencesa and summations.

Having a hard time figuring out how best to do this problem. I do not want the answer, just a good shove in the right direction and as much explanation as possible thanks. This is one of the toughest courses I have taken so I'll be around a lot until it ends. Thanks much.

Not sure how I am suppose to use the first formula from a previous exercise to help with the 2nd.

2. Originally Posted by Nickolase
Having a hard time figuring out how best to do this problem. I do not want the answer, just a good shove in the right direction
Just carefully write all six terms, using brackets, in $\sum\limits_{k = 1}^6 {\frac{1}
{{k(k + 1)}}} = \sum\limits_{k = 1}^6 {\left[ {\frac{1}{k} - \frac{1}
{{k + 1}}} \right]}$
.
Then remove the brackets. See what happens.

3. Very quick reply, thanks very much. I believe I can work it from there, or at least hope so.

P.S. How do you write the symbols in the message body so easily?

4. Originally Posted by Nickolase
P.S. How do you write the symbols in the message body so easily?
Learn to post in symbols? You can use LaTeX tags.
$$\dfrac{d^2y}{dx^2}$$ gives $\dfrac{d^2y}{dx^2}$.

5. Originally Posted by Plato
Just carefully write all six terms, using brackets, in $\sum\limits_{k = 1}^6 {\frac{1}
{{k(k + 1)}}} = \sum\limits_{k = 1}^6 {\left[ {\frac{1}{k} - \frac{1}
{{k + 1}}} \right]}$
.
Then remove the brackets. See what happens.
Thanks Plato. Big help. Such a helpful forum.