Group 1- https://www.mathopolis.com/questions/q.html?id=5250&t=mif&qs=5250_5251_5252_5253_5254_5255_5256_5257_5258_5259&site=1&ref=2f657175616c2d6c6573732d677265617465722e68746d6c&title=457175616c2c204c65737320616e642047726561746572205468616e2053796d626f6c73
