Question

a) 5+10+15+....................................400
ex:5=5 ori 1,10=5 ori 2,15=5 ori 3

b)7+9+11+..........................................2013-5-7-9-2011
va rog ajutatima e urgent dau 10 pcte nu fiti rai

Answer 1

A) 5*(1+2+3+4+...+80) = 5*80*81 pe 2= 5* 3240=61200