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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.