gmatprep2011 wrote:

@sudhir18n

It does not mention whether second term minus first term or vice versa... Can it be C or E then?

That's a valid point. However, it should also mention n>=3, because we need at least two terms to even execute this condition.

With the above assumption, "C" would be the answer.

But, if the question were written like this:

S is an infinite sequence, in which each term

S_n=S_{(n-1)}-S_{(n-2)}, such that n>=3. What is the value of the 43rd member of the sequence?

1.

S_1=12.

S_3=3Answer would be A as nicely explained by sudhir18n.

_________________

~fluke