Question

determine o 20° termo da PG( 3,6,12...)

Answer 1

a 20 = ?
P.G.(3,6,12,...)
q = a 2 / a 1 
q = 6/3
q = 2
a 20 = a 1 . q^n-1
a 20 = 3 . 2^19
a 20 = 3 . 524288
a 20 = 1572864