COMEDK · Maths · 36. Probability
For a torch has 10 batteries are available out of which 4 are dead. If 3 batteries are selected without replacement and tested, then the probability that all 3 are dead is
- A \(\frac{1}{30}\)
- B \(\frac{1}{4}\)
- C \(\frac{1}{15}\)
- D \(\frac{1}{10}\)
Answer & Solution
Correct Answer
(A) \(\frac{1}{30}\)
Step-by-step Solution
Detailed explanation
Total number of batteries are 10 Number of dead batteries is 4 \(\therefore\) Probability \((\) all three dead \()=\frac{4}{10} \times \frac{3}{9} \times \frac{2}{8}=\frac{1}{30}\)
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