can you replace the symbols to make this statement true?
there are four different solutions
choose any four numbers for a, b , c and d so that they increase by a regular amount (i.e. are in an arithmetic sequence)
- what is the value of (a - b) - (c - d) in general?
- what is the value of (b - a) - (c - d) in general?
- other expressions e.g (d - a) - (b - c)