JAMB - Mathematics (2016 - No. 34)
The nth term of the sequence 3, 9, 27, 81.....is
3 x 3n-2
3 x 3n-1
3 x 3n+2
3 x 3n+1
説明
3,9,27,81,.....
r = \(\frac{9}{8}\) = 3
Tn = arn-1
Tn = 3(3)n-1 = \(\frac{3(3^2)}{3}\)
r = \(\frac{9}{8}\) = 3
Tn = arn-1
Tn = 3(3)n-1 = \(\frac{3(3^2)}{3}\)