# Three subjects

In a class of 40 students, 18 passed mathematics, 19 passed accounts, 16 passed economics, 5 mathematics and accounts only, 6 mathematics only, 9 accounts only, 2 accounts and economics only, if each student offered at least one of the subjects.

a) how many students failed in all the subjects? .

b) find the percentage number who failed in at least one of economics and mathematics.

c) calculate the probability that a student selected at random failed in accounts

a) how many students failed in all the subjects? .

b) find the percentage number who failed in at least one of economics and mathematics.

c) calculate the probability that a student selected at random failed in accounts

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