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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: 127345