Find the first four terms of the given sequence tn = (-1) n (n).

A.

-1, - 2, - 3, - 4

B.

-1, 2, - 3, 4

C.

1, ½, 2/3, ¾

D.

1, 2, 3, 4

First we rewrite the expression correctly:

tn = ((-1) ^ n) * (n)

We now look for each of the terms:

t1 = ((-1) ^ 1) * (1) = - 1

t2 = ((-1) ^ 2) * (2) = 2

t3 = ((-1) ^ 3) * (3) = - 3

t4 = ((-1) ^ 4) * (4) = 4

The first four terms of the sequence are then:

-1, 2, - 3, 4

Answer:

B.

-1, 2, - 3, 4