As level math P1 discussion for 9th may

I have my exam tomorrow. Anyone has the paper of Feb 2018 ?

I've got an exam tomorrow too, along with IT Theory

I couldn’t find that paper

i found this question about sequences and i don’t seem to know how to continue any further. “The sun of the first n terms of an arithmetic progression is 1/2(3n+7). Find the first term and the common difference of the progression.” This is what i’ve done so far but i’m not sure how to eliminate any of the variables. Any help would be appreciated xx (btw reference is nov.17 paper 12)

If $a_n$ is the sequence, and $S_n$ the sum, then $S_n = a_1 + a_2 + ... + a_n$.

So, what do you get if you calculate $S_n - S_{n-1}$?

a_n?

Yes. So since you are given a formula for $S_n$, you can find a formula for a_n. Once you have a_n, then $a_1$ is the first term, and $a_k - a_{k-1}$ should equal the same thing for any choice of k and be the common difference.

Do u guys feel like ur prepared ? Idk for me , how many past papers did u guys do : (

Yes. So since you are given a formula for $S_n$, you can find a formula for a_n. Once you have a_n, then $a_1$ is the first term, and $a_k - a_{k-1}$ should equal the same thing for any choice of k and be the common difference.

Which exam board is this?

Here is the question paper

You posting??

You posting??