I'm very confused with data efficiency questions. I know the goal is to determine whether the conditions are sufficient to answer the question and not to find the answer of the question. Sometimes, I see that a condition is not sufficient, but it's indeed sufficient when I check the answer. Especially those odd and even data efficiency questions, I get them wrong all the time. I must be missing something. Please help.
Search the board for DS Strategydoctortt wrote:I'm very confused with data efficiency questions. I know the goal is to determine whether the conditions are sufficient to answer the question and not to find the answer of the question. Sometimes, I see that a condition is not sufficient, but it's indeed sufficient when I check the answer. Especially those odd and even data efficiency questions, I get them wrong all the time. I must be missing something. Please help.
Also, it might be helpful to buy mgmat guides on the relevant topics. They have great DS approach (AD/BCE method, which you can find somewhere online as well)
