Question

In an arithmetic sequence, the first term is 2 and the second term is 5. Find the common difference.

Answer 1

d = 3

Explanation:

In an arithmetic sequence the common difference is always the difference between the next term and the previous term:

`d= a_2-a_1=a_3-a_2=...=a_(150)-a_(149)=....`

we have:
`a_1=2\quad and\quad a_2=5`

so:

`d=5-2 =3`