Question

Calcule a soma : Dos 50 primeiros múltiplos positivos de 5

Answer 1

5+10+15+20+25+30+35+40+45+50+55+60+65+70+75+80+85+90+95+100+105+110+115+120+125+130+135+140+145+150+155+160+165+170+175+180+185+190+195+200+205+210+215+210+215+220+225+230+235+240= 6305

Answer 2

  a1 = 0
  
  n = 50
  r = 5

a50 = 0 + 49*5 =  245
  

S50 = ( 0 + 245).50 ==> S50 = 245*25 ==> S50 = 6125
                 2