from the question, we were told that the probability of Levente passing each of the module is 0.78
therefore,
a) the probability of Levente passing all three modules is
= 0.78^3
= 0.47
b) the probability of Levente passing two of the modules is
= (0.78^2)(1 - 0.78)
= (0.6084)(0.25)
= 0.15
c) the probability of Levente passing none of the modules is
= (1 - 0.78)^3
= (0.25)^3
= 0.015