Question

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

Answer 1

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