Question

Determine o n° de termos da Pg ( 3,21, .............17294403 )

Answer 1

a1 = 3
a2 = 21
q = 21/3 = 7 ****
an = 17294403

an = a1* q^n-1
17294403 = 3 * 7^n-1
7^n-1 = 17294403/3 =5764801= 7^8
7^n-1 = 7^8
n - 1 = 8
n = 8 + 1 = 9 ****