31. The probabilities that a student passes in Mathematics, Physics and Chemistry are $\mathrm { m } , \mathrm { p }$ and c , respectively. Of these subjects, the student has a $75 \%$ chance of passing in atleast one, a $50 \%$ chance of passing in atleast two, and a $40 \%$ chance of passing in exactly two. Which of the following relations are true? (A) $\mathrm { p } + \mathrm { m } + \mathrm { c } = 19 / 20$ (B) $p + m + c = 27 / 20$ (C) $\mathrm { pmc } = 1 / 10$ (D) $\mathrm { pmc } = 1 / 4$
31. The probabilities that a student passes in Mathematics, Physics and Chemistry are $\mathrm { m } , \mathrm { p }$ and c , respectively. Of these subjects, the student has a $75 \%$ chance of passing in atleast one, a $50 \%$ chance of passing in atleast two, and a $40 \%$ chance of passing in exactly two. Which of the following relations are true?\\
(A) $\mathrm { p } + \mathrm { m } + \mathrm { c } = 19 / 20$\\
(B) $p + m + c = 27 / 20$\\
(C) $\mathrm { pmc } = 1 / 10$\\
(D) $\mathrm { pmc } = 1 / 4$\\