Question

Qual a ordem do termo 12288 na PG (3, 6, 12, ...).

Answer 1

an = a1. q^n-1

12288 = 3. 2^n-1

12288/3 = 2^n-1

4096 = 2^n-1

2^12 = 2^n-1

12 = n-1

12+1 = n

n = 13. ====> 13° termo