Clearly, you are doing what ETS wants from all the students: attacking the question brute force and waste time. Moreover, the first way is more prone to errors than logic and a clear strategy.
An official question, even the most difficult, always have a sort of short cut that permits you to gain time and mental energy for the next tough question.
There is always an alternative and faster approach to the question in front of you.
Try to read this meanwhile
https://gre.myprepclub.com/forum/the-defin ... -8898.html and this
https://gre.myprepclub.com/forum/gre-quant ... 10440.htmlAnd always try to learn from when you pick the wrong answer. Always you learn from your mistake more than your good pick.
Let me know you do need else.
Also, use our math book to reinforce and master your quant skills. They are directly proportional to your confidence in solving a question
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