SSC CHSL 5 Mar 2018 Shift 1 Paper

Expression : abABABAB, ABabABAB, ABABabAB, ABABABab, abABABAB, _______________.
The pattern followed is that in each term there are 4 combinations of 'AB' and in each term, the first two terms in increasing order (in pairs) are small alphabets.
Thus, in the missing term, the third and fourth term will be small = ABabABAB