Given an=2n+1?

Question

1.Given an=2n+1

a. The first four terms of the sequence are 1, 3, 5, 7 and the sequence is arithmetic.
b. The first four terms of the sequence are 3, 5, 7, 9 and the sequence is arithmetic.
c. The first four terms of the sequence are 3, 5, 7, 9 and the sequence is neither arithmetic nor geometric.
d. The first four terms of the sequence are 2, 4, 8, 16 and the sequence is geometric.

2.Geiven an=n-1/n?
A. the first four terms of sequence?
B. is the sequence is gemetric , arithmatic, neither

Answer 1

1.1.choice b

2.0,1/2,2/3,3/4
neither

Answer 2

a) No. PA
an = 2n + 1
an = 2*4 + 1
an = 9
b) Yes. PA
an = 2n + 1
an = 2*4 + 1
an = 9
c) PA
d) P.G.
Q = 2

2.
a) an = n-1/n
an = (4-1)/4
an = 3/4
an = a1 + (n-1)r
3/4 = a1 + (4-1)r
3/4 = a1 + 3r
3/4 - 3*1/3 = a1
a1 = 1/4

b) P.G.
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Answer 3

1) B

2a) 0, -0.5, -2.7, -3.75
2b) aritmatic

Answer 4

As I said.........