Question

care este al 100lea nr al sirului 105,110,115,120,125,130. a605. b600. c610

Answer 1

primul termen105=100+5*1
al doilea termen=110=100+5*2
al treilea termen=115=100+5*3
al patrulea termen=120+100+5*4
al cincelea termen=125=100+5*5
al saselera termen=130+100+5*6
........................................................
al 100 termen=?=100+5*100=100+500=600
raspuns corect b)