Question $18(1$ point$)$

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With respect to the table below, what is the entry for the cell that contains a series of $3$ question marks $(???).$ Note that in order to render the table in HTML for CourseLink to display it properly, the top row is the parent information for the individuals listed in the second row. Cells that are blank are not needed in the calculation for this question.

$\backslash$table$[[,--,$A $-,$A B$,$A C$,$A D$],[,$A$,$B$,$C$,$D$,$E$],[A,1,\frac{1}{2},\frac{3}{4},\frac{7}{8},\frac{15}{16}$