The nth term of the sequence -2 4 -8 16 is give... - WAEC Mathematics 2010 Question
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 option: b
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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