Consider the sample space and two events A and B as is illustrated in the following figure. Suppose that P({E1}) = .05, P({E2}) = .15, P({E3}) = .25, P({E4}) = .1, P({E5}) = .05, P({E6}) = .15, P({E7}) = .25.

Determine P(A^c?B^c).

A B O E1 OE 2 O E4 O Es OE 3 . E7 O E6 S