Question

quantos termos tem a P.G (3,6,...,48)

Answer 1

a1 = 3

an = 48

an = a1.q^n-1

3.q^n-1 = 48

2^n-1 = 16

2^n-1 = 2^4

n - 1 = 4

n = 4+1

n = 5