Question

1)What are the first five terms of the sequence given by the formula an=4n+1 ? a. 1,5 ,9,13,17 b. 9,13,17,21,25 c. 5,9,13,17,21 d. 4,8,12,16,20 2)Write a recursive definition for the sequence 8,6,4,2 ... a. a1=8, an=an-1-2 b. a1=2, an=an-1+6 c. a1=8,an=an-1+2 d. a1=2, an=an-1+8

Answer 1

Hello,

1)
I don't if in USA, we count beginning with 0 or beginning with 1

if you count 0,1,2,3,4,5,6... a(0) being the FIRST term the answer is A
if you count 1,2,3,4,5... a(1) being the first term (in this case how do you call a(0) the zeroth term?) the answer is C

In Europ, the first term is a(0).

2)

a(1)=8 Is it the FIRST term?
a(n)=a(n-1)-2
Answer A