[질문] 1부터50 까지자연수의 합은??

1+2+3+4+5+6+.........+25}50+49+48+47+46+45+...........26}반을접어요^^그럼위와아래합을하세요^^51+51+51+.........+51이죠??그런데51이25개이니까51x25=1275