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

  • Tn = 2n
  • Tn = (-2)n checkmark
  • Tn = (-2n)
  • Tn = n

The correct answer is: B

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
Previous Question Next Question

Leave A Comment