Look at the sequence in this table

Question

n 1 2 3 4 5 ...
An -1 1 3 5 7 ...

Which function represents the sequence?
A) an = an - 1 + 1
B) an = an - 1 + 2
C) an = 2an - 1 -1 ***
D) an = 2an -1 - 3

Answer 1

notice that the values of a_n increase by 2
so we need something like ?? = ?? + 2
there is only one such pattern and it is B

It should have been:
a_n = a_n-1 + 2, a₁ = -1 , n>1

that last part must be included, or else the sequence has no start

Answer 2

I know I might be late to tell you this, but thank you so much!