Question

Andrei rezolva probleme de matematica astfel incat in fiecare zi rezolva o problema mai mult decat in ziua precedenta.Cate probleme a rezolvat Andrei intr-o saptamana daca in prima zi a rezolvat:a.0 probleme? b.2 probleme? c.3 probleme?

Answer 1

a) 0+(0+1)+(0+2)+(0+4)+(0+5)+(0+6)+(0+7)=1+2+3+4+5+6+7=28
b)2+3+4+5+6+7+8=35
c)3+4+5+6+7+8+9=38