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

Explanation

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

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