The nth term of a sequence is given by (-1)(^{n-2}) x 2(^{n+1}). Find the sum of the second and third terms.
-
A.
-2 -
B.
1 -
C.
2 -
D.
6 -
E.
12
Correct Answer: Option A
Explanation
when n = 2
(-1)(^{n-2}) 2(^{n+1}) = 2
When n = 3
(-1)(^{n-2}) 2(^{n+1}) = -4
Sum = 2 – 4 = -2