1. Classify t he sequence as arithmetic, geometric, Fibonacci or none of these and supply the next term. If Arithmetic give d; if geometric give r; if Fibonacci give the first two terms..

(a) 3,4,5,6,....

(b) 21,20,18,15,11,...

(c) 2,5,8,11,14,....

(d) 2,4,6,10

2. Find the first three terms of the sequence whose nth term is given by:

Sn=3n-2

3. Find S5 when Sn = 40-8n

4. Fill in the blanks so that ____, 8, _____, _____, 27, ____,...

is

(a) an arithmetic sequence

(b) a geometric sequence

(c) a sequence that is neither arithmetic nor geometric for which a general term can be written

5. Find the 12th term of the sequence Sn = (-1)^n (n+9)