A) 18
B) 20
C) 21
D) 19
Correct Answer: D
Solution :
\[\begin{align} & \text{Number of red balls }\,\,\,\,\,\,\,\,=~~~~~\text{6} \\ & \text{Number of blue balls }\,\,\,\,\,=~\underline{~~~~\,\,\text{9}} \\ & \text{Number of white balls }=\underline{~~+\,\,\text{4}} \\ \end{align}\]
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