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In Verbal OG 2016, I came across an explanation for one of the RC questions which is given below:
An evaluation of whether or not to make these investments must be made on the same basis.
As per what I have read before, 'Whether' should be used when you don't know the outcome. e.g. I don't know whether I will go to school. And 'Whether or not' should be used when the outcome is known no matter what the situation is. e.g. I will go to school whether or not it rains.
In the OG example, I think it does not have a known outcome since the decision to make an investment can change with the said 'basis'. Is it correct to use 'whether or not' in such a sentence ?
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The context for such sentences is very important. When you say I don't know whether I will go to school, it means you are not sure. When you say I will go to school whether or not it rains, it means you will go to school irrespective of the situation. Since in the question stem it is An evaluation of whether or not to make these investments must be made on the same basis, it means we are not sure. And hence whether or not can be used. Another way to rewrite this sentence could be - An evaluation of whether to make these investments or not to make these investments must be made on the same basis.
Practically speaking, if you have to choose between 'whether' and 'whether or not' on a GMAT problem, the former is probably right. In a lot of contexts, including most problems I've seen, the latter is considered redundant. A good rule of thumb is that if you can replace 'whether or not' with 'whether' without making the sentence ungrammatical, and some of the answer choices let you do that, you should pick one of those.
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