Question

Determine o decimo segundo termo da PA (3,5,7)

Answer 1

a12=3+11.2
a12=3+22
a12=25

Answer 2

an = ? an=a1+(n-1)r
r=2 an=3+(12-1)2
a1=3 an=3+24-2
n=12 an=25

PA=(3,5,7,9,11,13,15,17,19,21,23,25)