Mathematics

The nth term of a sequence is given by (-1)(^{n-2}) x 2(^{n+1}). Find the sum…

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