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SEAMO 2027 - Paper F - SET 09 - Self-study Question 22

SEAMO · SEAMO 2027 - Paper F - SET 09 - Self-study

Question 22

A man tells the truth 3 out of 4 times. He throws a fair die and reports a 6. It is known that whenever the result is not 6 and he is lying, he reports a 6. Find the probability that the actual result is 6.

Probability assumption for self-study: truth-telling is independent of the die result; for each face, he tells the truth with probability 3/4 and lies with probability 1/4.
  1. $1/8$
  2. $1/4$
  3. $3/8$
  4. $3/11$
  5. $5/11$