Here are a couple of recent ones that I am unable to figure out.
If 2 of the 4 expressions, x+y, x+5y, x-y, and 5x -y are choosen at random, what is the probabilty that their product will be of the form x^2 - (by)^2, where b is an integer?
a). 1/2
b). 1/3
c). 1/4
d). 1/5
e). 1/6
The answer is (e)
y< x+z/2 ?
1). y-x < z-y
2). z-y> z-x/2
If 2 of the 4 expressions, x+y, x+5y, x-y, and 5x -y are choosen at random, what is the probabilty that their product will be of the form x^2 - (by)^2, where b is an integer?
a). 1/2
b). 1/3
c). 1/4
d). 1/5
e). 1/6
The answer is (e)
y< x+z/2 ?
1). y-x < z-y
2). z-y> z-x/2
. 
