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A melhor resposta!
2014-08-07T23:19:02-03:00
Q=?                         an=a1.q^n-1
n=6                        243=1.q^6-1        
na=243                  243=1.q^5
                               3^5=1.q^5
                                    q=3/1
                                    q= 3
PG (1,3,9,27,81,243).
4 4 4