A new make of scientific calculator has been recently launched and is being advertised on television. the manufacturer believes that if a teacher is selected at random, the probability that the teacher watches television and sees the commercial between the hours of 15:00 and 06:00 is 4 13 . furthermore, if a teacher sees the commercial then the probability that the teacher recommends it to the learners is 26 38 . what is the probability that the teacher selected at random will watch television and recommend it to the learners?