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OG15 Im having a hard time understanding the concept of how

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Im having a hard time understanding the concept of how to go about Data Suffieciency questions.
Here it says n is even. Am I supposed to only plug in even numbers in the options and see which one stands correct ?
Or is there another strategy here.

2 Answers

Study total explanation chart in MATHEMATICS SIMPLIFIED by JAGGAN SANEJA ..available on Amazon, infibeam, bookadda in your country also,
answered Jun 14, 2016 by Student (71 points)
Take option 2 --* 3n+4 can be even only when n is even, so it answers our question. Now, look at option 1 --* n^2 - 1 is odd means n^2 is even which again tells that n is even. So the 2 options are independently sufficient --* option D
answered Jun 14, 2016 by Beginner (1 point)
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