Copykwik has four photocopy machines: A, B, C, and D. The probability that a given machine will break down on a particular day is given below.

P(A) =

1

55

P(B) =

1

57

P(C) =

1

80

P(D) =

1

36

Assuming independence, what is the probability on a particular day that the following will occur?

(a) All four machines will break down (Round your answer to ten decimal places.)

Incorrect: Your answer is incorrect.

(b) None of the machines will break down