Question

Quantos termos tem uma pg onde a1=6, q,=2 e an=384

Answer 1

an=a1*q^n-1
384=6*2^n -1
384/6=2^n -1
64=2^n -1
2^6=2^n -1
n-1=6
n=6+1
n=7

Answer 2

an=a1.q^n-1 384=6.2.^n-1 384/6=2^n-1 64=2^n-1 2^6=2^n-1 6=n-1⇒n=6+1∴n=7