Question

Find the first 4 terms and the 8th term of the recursively defined-series

c1=2
c2=-1
ck+2=c(k)+c(k+1)

Answer 1

I'm just wondering if you can find c8 with out havign to find c5, c6, and c7 ?

Answer 2

@doulikepiecauseidont I know you can with the CX CAS.

Answer 3

Crap, but seriously, can you firgure out the 8th term without going through the middle, Ik howe to arrive at the answer but only by going through c(5-7)

Answer 4

Is there a systematic way to do it?