Question

Aflati suma tuturor nr. care impartite la 100 dau catul egal cu rest.

Answer 1

d=cxi+r unce r<100 implicit c<100
c=r⇒d=cxi+c=c(i+1)=c(100+1)=101c⇒d=101c

daca c=1⇒d=101
c=2⇒d=202
c=3⇒d=303
................
c=99⇒d=9999
101+102+102+...+9999=101(1+2+3+...+99)=101*99*100:2=499950