If P and Q are positive integers, P - 1 is divisible by 2 and Q - 3 is divisible by 4, all of the following could be the value of P - Q Except?  Choices
A) 9
B) 2
C) 4
D) 6
E) 12
P-1 = 2Q   =&gt; P = 2Q + 1 = 1,3,5,7,9,11,13,15,17,19,21,23,25   Q-3 = 4P   =&gt; Q = 4P + 3 = 3,7,11,15,19,23,27,31,35,39,43,47   2=5-3   4=11-7   6=17-11   12=23-11   So , we can see that all the answer choices are possible here except 9
<result>A</result>
If P and Q are positive integers, P - 1 is divisible by 2 and Q - 3 is divisible by 4, all of the following could be the value of P - Q Except?