A purse contains 2 six sided dice. One is a normal fair die, while the other has 2 ones…
Mathematics · JEE Advanced · NTA Exams — Statistics and Probability
A purse contains 2 six sided dice. One is a normal fair die, while the other has 2 ones, 2 threes, and 2 fives. A die is picked up and rolled. Because of some secret magnetic attraction of the unfair die, there is 75% chance of picking the unfair die and a 25% chance of picking a fair die. The die is rolled and shows up the face 3 . The probability that a fair die was picked up, is
- \(\frac{1}{7}\)
- \(\frac{1}{4}\)
- \(\frac{1}{6}\)
- \(\frac{1}{24}\)
Answer
(A) 1 7
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