Is pq = 1?
(1) pqp = p
(2) qpq = q
OA is E
I have found lot many posts on this topic.
solution of (1) is p = 0 or pq = 1
solution of (2) is q = 0 or pq = 1
Combining, MGMAT says the answer is E.
Explanation from experts:
we could certainly pick p=q=1 to get a "yes" answer to the question.
However, we could also pick p=q=0 to get a "no" answer to the question.
Therefore, even after combining we don't have enough info to solve: choose E.
I disagree here:
Lets take another similar example:
is x=2 ?
1) (x-1)(x-2)=0
2) (x-2)(x-3)=0
I will mark answer of the above question as C.
as 1) gets x=1 or x=2
2) gets x=2 or x=3
Combining we get x=2 , hence answer is C.
In the original pq question the answer should be C as after combining we will get pq=1 solution.
(1) pqp = p
(2) qpq = q
OA is E
I have found lot many posts on this topic.
solution of (1) is p = 0 or pq = 1
solution of (2) is q = 0 or pq = 1
Combining, MGMAT says the answer is E.
Explanation from experts:
we could certainly pick p=q=1 to get a "yes" answer to the question.
However, we could also pick p=q=0 to get a "no" answer to the question.
Therefore, even after combining we don't have enough info to solve: choose E.
I disagree here:
Lets take another similar example:
is x=2 ?
1) (x-1)(x-2)=0
2) (x-2)(x-3)=0
I will mark answer of the above question as C.
as 1) gets x=1 or x=2
2) gets x=2 or x=3
Combining we get x=2 , hence answer is C.
In the original pq question the answer should be C as after combining we will get pq=1 solution.
