\left. \begin{array} { | c | c | c | c | } \hline 5 & { 9 } & { 8 } & { 7 } \\ \hline 8 & { 6 } & { 9 } & { 10 } \\ \hline 7 & { 13 } & { ? } & { 19 } \\ \hline 5 & { 7 } & { 8 } & { 9 } \\ \hline ( a ) & { 10 } & { ( b ) } & { 12 } & { ( c ) } & { 9 } & { ( d ) } & { 15 } \\ \hline \end{array} \right.

\left. \begin{array} { | c | c | c | c | } \hline 5 & { 9 } & { 8 } &

1.	\left. \begin{array} { \| c \| c \| c \| c \| } \hline 5 & { 9 } & { 8 } & { 7 } \\ \hline 8 & { 6 } & { 9 } & { 10 } \\ \hline 7 & { 13 } & { ? } & { 19 } \\ \hline 5 & { 7 } & { 8 } & { 9 } \\ \hline ( a ) & { 10 } & { ( b ) } & { 12 } & { ( c ) } & { 9 } & { ( d ) } & { 15 } \\ \hline \end{array} \right.
Answer» The sum of columns is 25,35, 45. The third column sum can be 40 so option d is correct.