Question

Determine o décimo segundo termo da P.A. (-2,1,4...)

Answer 1

an= a1 + (n - 1).r
a12= -2 + (12-1).3
a12= -2 + 33
a12= 31

Answer 2

an=a1+(n-1).r
an= -2+(12-1).3
an=-2+11.3
an =-2+33
an = 31