Question

quantos termos tem a pg (3,6,12....,3072) ?

Answer 1

a1 = 3
an = 3072
q = a2/a1 => q= 6/3 => q = 2

an = a1 * q^n-1
3072 = 3 * 2^n-1
1024 = 2^n-1
2^10 = 2^n-1
_________
10 = n-1
n = 10+1
n= 11