15) Select the logical expression that is equivalent to: x(P(x)Q(x)) a. x(P(x)Q(x)) b. x(P(x)Q(x)) c. x(P(x)Q(x)) d. x(P(x)Q(x)) 16) The domain for variables x and y is the set {1,2,3}. The table below gives the values of P(x,y) for every pair of elements from the domain. For example, P(2,3)=F because the value in row 2 , column 3 , is F. Select the statement that is false. a. xyP(x,y) b. xyP(x,y) c. yxP(x,y) d. yxP(x,y) 17) Select the logical expression that is equivalent to: xy(P(x)Q(x,y)) a. xy(P(x)Q(x,y)) b. yx(P(x)Q(x,y)) c. yx(P(x)Q(x,y))