The probability that speaks truth is 4/5, while this probability for is 3/4. The probability that they contradict each other when asked to speak on a fact is
7/20
1/5
3/20
4/5
As we learnt in
Probability of occurrence of an event -
Let S be the sample space then the probability of occurrence of an event E is denoted by P(E) and it is defined as
- wherein
Where n repeated experiment and E occurs r times.
Probability of A speakig truth , P(AT) =
Probability of F speakig false P (AF) =
Probability of B speakig truth P (BT)
Probability of B speakig truth false P (BF)
Elements where they contradict
Probability
Option 1)
7/20
Correct
Option 2)
1/5
Incorrect
Option 3)
3/20
Incorrect
Option 4)
4/5
Incorrect
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