Respostas

  • Ind
  • Ambicioso
2013-11-27T17:34:47-02:00
A8=a4+4r
65=21+4r
4r = 44
r= 11

A4=a1+3r
21 = a1 + 33
a1= -12
PA : (-12, -1, 10 , 21, 32, 43, 54, 65, ....)