The nth term of the sequence -2, 4, -8, 16.... is given by
MATHEMATICS
WAEC 2010
The nth term of the sequence -2, 4, -8, 16.... is given by
- A. Tn = 2n
- B. Tn = (-2)n
- C. Tn = (-2n)
- D. Tn = n
Correct Answer: B. Tn = (-2)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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