What formula would I use to complete this?

In cells C2:C12, use a function to calculate the number of work days between thestart dates in cells A2:A12 and the end dates in cells B2:B12 not considering the holiday dates in cells G2:G12. Your formula should leave the number of work days blank in column C if the end date is blank in column B. Hint: Use an IF statement. Check Figure: Cell C4 = 169

\begin{tabular}{|l|r|} \multicolumn{1}{c|}{ F } & \multicolumn{1}{c|}{ G } \\ \cline { 2 - 2 } & \multicolumn{1}{c|}{ Date } \\ \hline New Year's Day & 1/1/18 \\ \hline Martin Luther King Jr. Day & 1/15/18 \\ \hline Presidents' Day & 2/19/18 \\ \hline Easter & 4/1/18 \\ \hline Memorial Day & 5/28/18 \\ \hline Independence Day & 7/4/18 \\ \hline Labor Day & 9/3/18 \\ \hline Columbus Day & 10/8/18 \\ \hline Veterans Day & 11/11/18 \\ \hline Thanksgiving Day & 11/22/18 \\ \hline Christmas Day & 12/25/18 \\ \hline \end{tabular} \begin{tabular}{|l|r|} \multicolumn{1}{c|}{ F } & \multicolumn{1}{c|}{ G } \\ \cline { 2 - 2 } & \multicolumn{1}{c|}{ Date } \\ \hline New Year's Day & 1/1/18 \\ \hline Martin Luther King Jr. Day & 1/15/18 \\ \hline Presidents' Day & 2/19/18 \\ \hline Easter & 4/1/18 \\ \hline Memorial Day & 5/28/18 \\ \hline Independence Day & 7/4/18 \\ \hline Labor Day & 9/3/18 \\ \hline Columbus Day & 10/8/18 \\ \hline Veterans Day & 11/11/18 \\ \hline Thanksgiving Day & 11/22/18 \\ \hline Christmas Day & 12/25/18 \\ \hline \end{tabular}