WAEC - Mathematics (2010 - No. 23)
The nth term of the sequence -2, 4, -8, 16.... is given by
Tn = 2n
Tn = (-2)n
Tn = (-2n)
Tn = n
解释
sequence: -2, 4, -8, 16........{GP}
a = -2; r = \(\frac{4}{-2}\) = -2
nth term Tn = arn-1
Tn = (-2)(-2)^n-1
Tn = (-2)1 + n - 1
Tn = (-2)n
a = -2; r = \(\frac{4}{-2}\) = -2
nth term Tn = arn-1
Tn = (-2)(-2)^n-1
Tn = (-2)1 + n - 1
Tn = (-2)n