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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
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
Source: Myschool Past Questions Archive (Record #36559)