In a sequence of terms in which each term is three times the previous term, what is the fourth term?
(1) The first term is 3.
(2) The second-to-last term is 310.
If the 1st term is 3 then 2nd term will be 3*3 = 9 , 3rd term = 9*3 and 4th term is 9*3*3
so A is suf
310 is second to last but w/o the first term we cannot determine the number of terms hence B is insuf