If x, y, and z are positive integers, is x – y odd ?
(1) x=z^2
(2) y=(z-1)^2
Answer is C.
What is a quicker way?
(1) x=z^2
(2) y=(z-1)^2
Answer is C.
What is a quicker way?
i am not sure if its a quickest way.. but plugging can also help u do this problem in less than 2 mints...u shud realise that X can either Even/Odd depending on Z. and Y can be Even/Odd depending on Z though Mutually exclusive i mean both cant be even or odd at the same time .smclean23 wrote:If x, y, and z are positive integers, is x – y odd ?
(1) x=z^2
(2) y=(z-1)^2
Answer is C.
What is a quicker way?
if u realise that its a plain ride from there on.
I go with C as well..
