C1 arithmetic sequences Help!

Hi everyone,
I was just wodering if asked to proove a formula for ARITHMETIC sequences will it only be the Sn=n/2(2a+(n-1)d) or are you ever asked to prove Un=a+(n-1)d?
Thank you =)

Reply 1

shawn_o1

S_n is the arithmetic series (sum of terms in an arithmetic sequence)
U_n is a recurrence relation of the arithmetic sequence involved

Reply 2

Buzz321

Original post by shawn_o1

S_n is the arithmetic series (sum of terms in an arithmetic sequence)
U_n is a recurrence relation of the arithmetic sequence involved

Okay thanks but do we need to prove the reccurence relation one? :s-smilie:

No you don't

Original post by shawn_o1

No you don't

Awesome thank you so much :smile:

Reply 5

pri12321

Original post by Buzz321

Hi everyone,
I was just wodering if asked to proove a formula for ARITHMETIC sequences will it only be the Sn=n/2(2a+(n-1)d) or are you ever asked to prove Un=a+(n-1)d?
Thank you =)

Arithmetic Sequences are in C2 aren't they?