A fair coin is tossed 4 times and the events A and B are defined as follows: A: {At least 2 heads is observed} B: {The number of heads is odd} Use the knowledge of marginal, union, intersection and conditional probabilities to describe the probability that fewer than 2 heads is observed, given the number of heads is even, using events A and B.

P(A^c|B)

P(A^c|)

P(A^c B^c)

P(A^cU B^c)