ExplanationWrite out sequences until you see the pattern.
The second term in the sequence is 3(–1) = –3.
Adding 3 gives you the third term, 0. Multiplying by –1 gives you the fourth term, also 0.
Adding 3 gives you 3, the fifth term. So the sequence repeats every four terms: 3, –3, 0, 0, 3, –3, 0, 0, and so forth.
Dividing 168 by 4 gives you a remainder of zero, and the fourth, eighth, twelfth, and every other nth term where n is a multiple of 4 (including the 168th term) will all
be the same value, 0. The answer is choice (C).
_________________
SandyIf you found this post useful, please let me know by pressing the Kudos ButtonTry our free Online GRE Test