For example b) :
you can "see" that there is a common ratio between the 2 numbers :
For a) :
You have no idea how to do. Because you know what the examples look like, see if it is like in b), where there is a common ratio :
Answer is no.
Now try common difference.
Aswer is no.
So now, let's try something in the form .
Is there a unique solution to the system ?
See if the solutions you find fit with the other couples
This is my 24th post ^^