A) 1
B) 2
C) 3
D) 4
Correct Answer: C
Solution :
[c] Let E = Event of guessing the correct answer to a certain question. |
Probability (guessing the correct answer) |
\[P(E)=\frac{P}{12}\] (Given) |
Probability (not guessing the correct answer). |
\[P(\bar{E})=\frac{3}{4}\] (Given) |
\[1-P(E)=P(E)\] |
\[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1-\frac{P}{12}=\frac{3}{4}\Rightarrow \frac{P}{12}=1-\frac{3}{4}=\frac{1}{4}\Rightarrow P=3\] |
So, the value of P is 3. |
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