Write a variable expression to describe the rule for the sequence.
half, 1,1and a half , 2, . . .
What you have here is an arithmetic progression. They all follow the same rule.
They have a first term,usually written as a
They have a common difference , usually written as d.
and they look like this
a , a+d,a+2d,a+3d,........ to a +(n-1)d.
Your first term here is 1/2, that is a =1/2.
The common difference is also 1/2, so d = 1/2 as well.
Now you should be able to write down the expression for your arithmetic progression.
