群数列です 第n群に入る自然数の総和Sの求め方を教えてください、 答えは(2n-1)(n^2-n+1)です
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![基本例題の[2]についてです。ここの条件ですが、
a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787814908&Signature=ym9gf4iOH9JYs~Ve39N9uhQuPbIk-~EZBZ5oxmh5kc~QuziOkgrtkC8AUCJaogqw98gnNmZbK86EWz0NUVyAuXXCFz8~9E1cm~4IvyA5VoqTxu~bT4UuOHYYVTvYbSkiIabRPiO9z28BsvbBYkggm0S01Nops56lJWeEsMF8khDV4evhnMdlOmPVutssEzZwJmnaQbO3pwcYyN7YPFRoxi4YnWmBubVg-~8t0qDrwWVMKTjQMSGBJ1pUqUZz-B2SPriGLxoCRoNZHvpyOdn4kvIwfLGsvabVowcBrg~JDYg7ZITvnGLWJL1ZdO4tom-CQbdKhASnTgCJ5gckAO92GA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787814908&Signature=jHgL3YUmMc3BtJ9367cLNqh8pfydSctonAR9h9vXlYYFLlvKG~ONBAcYKH-TcD~2O-kRChAs9WZzBIL4fgHD1Sw-cfK-9NwsbOoyHLgwI1rcPcGy0sbSAVJBSG6chuOy7w9Xov8vZDkfPt9xN78oivypAWwlvTJ~f7FbeTzwsc6Ag-d-A1yg863W3Jy7UpXIA22hz9wHMVpEa3zwABh-9RPVSzXuzKjUcNbPhGCR5Ye0Fq1q-J33XqZof-AkGKe0n~u35307MwsCjUGOkSwSfELAZf-2nOt6Av8Ha~EttGGCsfSbN8mj5iiGtdZWv1E-5nFe~iBNJrr3IKmH7eBIlQ__&Key-Pair-Id=K2W722D70GJS8W)
