DS question on PR CAT 5

[montefus]

Can someone please explain why the answer is not B? Thanks

Does x^2+y^2=x + y ?

1) x and y are consecutive integers
2) x = 1 + y

OA D

[montefus]

question should be

Can someone please explain why the answer is not B? Thanks

Does x^2-y^2=x + y ?

1) x and y are consecutive integers
2) x = 1 + y

OA D

[parallel_chase]

question should be

Can someone please explain why the answer is not B? Thanks

Does x^2-y^2=x + y ?

1) x and y are consecutive integers
2) x = 1 + y

OA D

x^2-y^2= x+y

(x+y)(x-y) = x+y

x-y = 1 ?????

Statement I

x and y are consecutive integers

x-y=1
x-y=-1

We dont know if x is greater or y is greater.

Therefore insufficient.

Statement II

x=1+y
x-y=1

Sufficient.

Hence B is the answer.

I think the OA is wrong. Let me know if anyone thinks otherwise.

[montefus]

I agree with your answer as well. This question was on PR CAT 5 and it said the correct answer is D...I don't see it.

[Ian Stewart]

I agree with both of you; the answer is certainly not D.