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There are four calculators and it is known that exactly two of them were defective. They Are tested one by one, in a random order till both the defective calculators are identified. Then the probability that only two tests are required is ____
There are four calculators and it is known that exactly two of them were defective. They Are tested one by one, in a random order till both the defective calculators are identified. Then the probability that only two tests are required is ____

```
3 years ago

Arun
25768 Points
```							there are 2 ways of getting the machines in the first 2 tries. First possibility, you get both faulty, or you get both correct(since, then you know the left ones are faulty). Thus solving both possibilities: (2/4)x (1/3) x 2 since both have same chancesHence when solving,We get answer as  1/3
```
3 years ago
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Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions