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Explanation to solution 1
n is the number of terms in the A.P.
For even numbers between 1 and 3 (which is 2), n is 1 and not 3
Plug this into the formula
- by art
Wed Oct 24, 2007 11:21 am- Forum: GMAT Math
- Topic: Difficult GMAT Math Problems
- Replies: 34
- Views: 130695