How to solve this

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Source: — Problem Solving |

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by kmittal82 » Thu Aug 12, 2010 2:25 am
The easiest way I think is to put the lowest value of n to see which one doesn't satisfy the criteria.

If you put n = 1, you can then eliminate (c) and (d)
for n = 2, you can eliminate (a)

Only option left is (b) which should be the answer.