1. The first term of S is 32 - Not sufficient - As we do not know about the type of sequence and the progression manner.
2. The 138th term of S is 1248 and each term of S after the first is 18 more than the preceding term. - Sufficient - As by applying AP formula we will get the 1st term and then by the same we can get the 121st term.
Thus ans is B
2. The 138th term of S is 1248 and each term of S after the first is 18 more than the preceding term. - Sufficient - As by applying AP formula we will get the 1st term and then by the same we can get the 121st term.
Thus ans is B