The probability that 9 students pass in Mathematics, Physics and Chemistry are m, p and c respectively, of these subject the students has a 75% chance of passing in at least one subject 50% chance of passing in at least two subject and 40% chance of passing in exactly two. Which of the following relation are true ?

• A. p + m + c =19/20
• B. p + m + c = 17/20
• C. pmc = 1/10
• D. pmc = 1/4