Question

what is the rule for the sequence 1,55,3,110,5,165

Answer 1

There is a sequence between the difference of consecutive terms

Answer 2

The difference between 55 and 1 is 54.
The difference between 3 and 55 is 52.

The difference between 52 and 54 is 2

Answer 3

so the common diference is 2

Answer 4

Similarly difference between 110 and 3 is 107.
Difference between 5 and 110 is 5.

And difference between 5 and 3 is 2