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# C1 (SeriesSequences) questions Watch

1. Having a bit of trouble with these;

1) Find in a simplified form
What is this actually asking for?

2) Someone invests £20 one month, then 25, then 30, then 35 and so on until he has made an investment £500. How much has she invested in total?

Is this using
Number of terms x sum of first and last / 2
So (96 x 520)/2 = £24 960

3) Find the first 4 terms in the sequences whos nth term is given by
Un =

4) Find the first 4 terms of sequence defined as follows;

5)3 consecutive terms of an arithmetic sequence are

3p-2, 4p-6, 9p+16

Find the value of p and the common difference.

-----------

+rep to help, even if its just the formula to use etc.
2. (Original post by jbeach09)
Having a bit of trouble with these;

1) Find in a simplified form
What is this actually asking for?
I'm only going to look at the first one.

It says what it wants but to help...

and you should know what is.
3. (Original post by Get me off the £\?%!^@ computer)
I'm only going to look at the first one.

It says what it wants but to help...

and you should know what is.
I got that far with the summation results page in my book, but I've got no idea what the next step is.

I was absent through most of the series lessons due to illness and have had this assignment, the questions with find the nth term are ok because I was in that, but these I've got no idea.

Surely that's saying the last value of r in the sequence is n, and the first value is 1, but whats the method next?
4. (Original post by jbeach09)
I got that far with the summation results page in my book, but I've got no idea what the next step is.

I was absent through most of the series lessons due to illness and have had this assignment, the questions with find the nth term are ok because I was in that, but these I've got no idea.

Surely that's saying the last value of r in the sequence is n, and the first value is 1, but whats the method next?

Post some working if you need any more help.
5. i also hate this topic but for the second one,
you use the formula : Sn: n/2(a +l)
so ur first term is 20 and your last term is 500, sub in those and work your way to the anser

for the 3rd one, just sub in 1 for n and do the same for 2 and 3 and 4 as they want the first 4

for the 4th one, ur meant to be using the recurrance method, so sub in 1 for n and they tell u that t1=4 so 4 times 3 and then minus one. then u will get t2 and use t2 to find t3 and so forth

the fifth and the first one are tricky
good luck
6. Thanks, managed to do them all apart from the last one and first one now

(Original post by Get me off the £\?%!^@ computer)

Post some working if you need any more help.
So would you do

or am I barking up the wrong tree?

If I still cannot get it, it's probably worth me going and having a word with my teacher tomorrow.
7. (Original post by jbeach09)
Thanks, managed to do them all apart from the last one and first one now

So would you do

or am I barking up the wrong tree?

If I still cannot get it, it's probably worth me going and having a word with my teacher tomorrow.
This bit

is just nx2.

Yes talking to your teacher is a good idea.

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