
### Instruction: help me answer this question Sum of the first p, q and r terms of an A.P. are a, b and c, respectively. Prove that (p - q)a + (q - r)b + (r - p)c = 0., think step by step
### Assistant: Explanation provided in the markdown text outlines the steps to derive the answer. It includes solving the first term a1 and common difference d equations simultaneously, and then substituting d in the terms (p - q)a, (q - r)b, and (r - p)c and adding them to get the desired result. , The answer is (p - q)a + (q - r)b + (r - p)c = 0.
