Question 179086
P... Q... (P&Q).. -(P&Q)
T... T....... T........... F
T... F....... F........... T
F... T....... F........... T
F... F....... F........... T

(P&Q) is only true when both P and Q are true, otherwise the value is false. 

Not (P&Q) takes values opposite of (P&Q) (False becomes true, true becomes false).