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## Homework Statement

Posted this thread earlier but had mis read the given answer. please disregard older thread as I dont know how to delete it!

Write down the condition for the numbers p, q, r to form an arithmetic sequence & geometric progression.

## Homework Equations

\ a_n = a_1 + (n - 1)d, ???

## The Attempt at a Solution

Have no idea, tried looking for similar examples on the net but they all seem to include numbers that are euidistant ie 5, 7, 9, 11......

All help is appreciated if someone could point me in the right direction about how to go about this!!