En una progresion aritmetica de 12 terminos y si su primer termino es - 2 y el ultimo - 52?

<img src="https://tex.z-dn.net/?f=No~especificaste~que~se~debe~hallar~asi~que~alguna~de~estas%5C%5Cdebe~ser%3A%5C%5C%5C%5C%0APrimer~Termino%3A%20a%3D-2%5C%5CUltimo~Termino%3A%20u%3D-52%5C%5C%0ANumero~de~terminos%3A%20n%3D12%5C%5CRazon%3A%20R%5C%5C%5C%5Cu%3Da%2B%28n-1%29R%5C%5CR%3D%5Cfrac%7Bu-a%7D%7Bn-1%7D%5C%5C%5C%5CR%3D%5Cfrac%7B-52%2B2%7D%7B12-1%7D%3D-%5Cfrac%7B50%7D%7B11%7D%5C%5C%5C%5C%0ALa~Progresion%3A%5C%5C%5C%5C-2%3B~-%5Cfrac%7B72%7D%7B11%7D%3B~-%5Cfrac%7B122%7D%7B11%7D%3B~-%5Cfrac%7B172%7D%7B11%7D%3B~-%5Cfrac%7B222%7D%7B11%7D%3B~-%5Cfrac%7B272%7D%7B11%7D%3B~-%5Cfrac%7B322%7D%7B11%7D%3B~-%5Cfrac%7B372%7D%7B11%7D%3B~-%5Cfrac%7B422%7D%7B11%7D%3B%5C%5C%5C%5C~-%5Cfrac%7B472%7D%7B11%7D%3B~-%5Cfrac%7B522%7D%7B11%7D%3B~-52%3B%5C%5C%5C%5C%5C%5CSuma~de~los~terminos%3A%5C%5C%5C%5CS%3D%5Cfrac%7B%28a%2Bu%29n%7D%7B2%7D%5C%5C%5C%5CS%3D%5Cfrac%7B%28-2-52%29%2812%29%7D%7B2%7D" />

<img src="https://tex.z-dn.net/?f=%5C%5CS%3D%28-54%29%286%29%5C%5CS%3D-324" />.