You might need
f(1) = 1
f(2)= 2
(f(n) = f(n − 2) + f(n-1)
f(3) =

f(3) = 3

Step-by-step explanation:

(1) = 1

f(2)= 2

(f(n) = f(n − 2) + f(n-1)

f(3) =f(3 − 2) + f(3-1)

      = f(1) + f(2)

      = 1 + 2

        = 3

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.

what is the original number? you forgot to add it.