Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?
a_ b_ a_ _n_bb_abbn
The pattern is abbn
So the first two blanks in a_b_ should be filled with b and n
The next two blanks a_ _ n should be filled with b and b
The next two blanks in _bb_ should be filled with a and n.
So the required letters are b,n,b,b,a and n.
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