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Thanks Bunuel, I understood that particular reply, but fundamentaly i did not get how has the reply reworded A (n+1)=An/n+1, from the real equation given in the question
First of all, if you look at the formula given in the initial post and the one given in mine, you'll notice that they're basically the same: just replaced n with n+1. Next, I didn't reworded the question, I changed it so that it would be more GMAT type.
In fact I did such questions but it was not mentioned that n>1. Thats why there was no problem in doing questions where even finding other values was not at all confusing. But I am unable to recover from the shock that this question gave.
Elements of this series gradually get smaller when n increases. Knowing 1 element would let us calculate the others, so definitely we will know how many is smaller than 1/2 1) is sufficient. 2) lets us to know the value of A2, so also sufficient.