A) 25
B) 13
C) 21
D) 23
Correct Answer: D
Solution :
\[\begin{align} & ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,T\,\,O \\ & \text{Number of friends invited by Ravi}~~~~~~~~~~~~~~~~~~~\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,=\,\,\,\,\,\,\text{6}\,\,\text{7} \\ & \text{Number of friends who came for Ravi}'\text{s birthday party }\,\,\,=-\,\underline{\,\,\text{4}\,\,\text{4}} \\ & \text{Number of friends who did not come}~~~~~~~~~~~~~~~\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,=\text{ }\,\,\underline{\,\text{2 3}} \\ \end{align}\]
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