Respuestas

2013-05-26T20:09:35+02:00
11x1 + 11x2 + 11x3 ....+ 11x 29
11( 29(29+1))/2 
11(29(30))/2 
11(29(15)) = 4785


17x1 + 17x2 + 17x3 + .............17x31
17(31(31+1))/2
17(31(32))/2
17(31(16)) =  8432