Yes, absolutely, if you can come up with an example that satisfies all of the conditions in the question, then that can be used to identify the correct answer in case of a problem solving question. Of course it is not easy to come up with an example in all cases because this method relies on trial and error, but yes this approach will work.
Also, keep in mind that a there may be cases where resorting to examples may not work or could be exceedingly difficult.
Here is an example of a problem that might be difficult to do by trial and error using the answer choices. This might even be too difficult for the GMAT, but if you can handle a problem like this then you are close to the Q51 target.
Can’t we solve it like this
96-69=27 and the difference between the digits will be 9-6=3.
Yes, absolutely, if you can come up with an example that satisfies all of the conditions in the question, then that can be used to identify the correct answer in case of a problem solving question. Of course it is not easy to come up with an example in all cases because this method relies on trial and error, but yes this approach will work.
Also, keep in mind that a there may be cases where resorting to examples may not work or could be exceedingly difficult.
Here is an example of a problem that might be difficult to do by trial and error using the answer choices. This might even be too difficult for the GMAT, but if you can handle a problem like this then you are close to the Q51 target.