A) 10
B) 12
C) 14
D) 8
Correct Answer: A
Solution :
Let there be x blue ball in the bag \[\therefore \]total number of balls in the bag \[=5+x\] Now, \[{{P}_{1}}=\] probability of drawing a blue ball\[=\frac{x}{5+x}\] \[{{P}_{2}}=\] probability of drawing a red ball 5 \[=\frac{5}{5+x}\] But, It is given that \[{{P}_{1}}=2{{P}_{2}}\] \[\frac{x}{5+x}=2\,\,\,\frac{5}{5+x}\] \[x=10\] Hence, there are 10 blue. balls in the bag
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