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(a) gives the solution of z as -1 and 3 hence sufficient
(b) gives the solution of z as 0 and 3 hence sufficient
hence the answer is D
Sent from my iPhone using GMAT Club Forum
This is an YES/NO data sufficiency question. A statement is sufficient if you can get a definite YES or definite NO answer to the question asked.
Do you have a definite YES or No answer to the question from any of the statements?
In both statements the equation has 2 solutions, and one of them is 3, so it could be a YES or a NOT, am I wrong?
Absolutely. That is why the answer is C and not D. When combined we know that z can only be 3, so we have an YES answer to the question.
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Glad the my reasoning was correct Thanks Bunuel! You guys from Gmatclub are giving me an incredible help in my preparation, and my GMAT is scheduled in two weeks :D
(a) gives the solution of z as -1 and 3 hence sufficient
(b) gives the solution of z as 0 and 3 hence sufficient
hence the answer is D
Sent from my iPhone using GMAT Club Forum
This is an YES/NO data sufficiency question. A statement is sufficient if you can get a definite YES or definite NO answer to the question asked.
Do you have a definite YES or No answer to the question from any of the statements?
ohh yes need a brainwash...since we have two answers from first equation and two answers from second equation...individually none of them suffice to answer the question, however when we combine them then we can say that z=3 ..hence option C
S1- z^2-2z-3=0 leads to (Z-3)(z+1) or z=3 or z=-1. Not sufficient as we have two solutions here S2- z^2-3z=0 leads to z(z-3) or z=0 or z=3. Again not sufficient as we have again two solutions here
When we combine these, we get z=3, hence sufficient. C