Question

Question #1abf2

Answer 1

There are two correct answers; a & c.

Explanation:

Arithmetic sequences are those whose terms have a common difference across all of the terms in the sequence and can be expressed using the following recursive definition:
`T_(n+1)=T_n+d`
`T_1=a`
Where the first term is equal to `a` and the common difference is `d`.
Option a can be expressed as follows:
`T_(n+1)=T_n+4`
`T_1=1`
Option c can be expressed as follows:
`T_(n+1)=T_n-4`
`T_1=1`

Hence both are arithmetic sequences (the other two options are geometric sequences with common ratios of 4 and 0.25 respectively)

Hope that helps :)