The pattern followed here is as follows: In the figure (i), In the first row only one circle is empty rest are colored. In the figure (ii), In first row circle are first empty, then colored and at last empty. In the figure (iii), In the second row, the circles are first colored then empty and at last colored. In the figure (iv), In the last row First circle is kept empty and rest 2 are colored. So, the figure that will come next in the series would have first empty, second colored and last empty.