Question

determinați catul si restul impartirilor : a) (1+2+3+...+56):45 b) (1+2+3+...+99):87 c) (1+2+3+...+199) :123 d) (1+2+3+...+300):504.

Answer 1

[(56*57/2)/45]=28*57/45=35, rest 21
[(99*100/2)/87]=56, rest 78
[(199*200/2)/123]=161, rest 97
[(300*301/2)/504]=89, rest 294