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Junior | Next Rank: 30 Posts
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by rajt » Sat May 19, 2007 11:29 am
Is my reasoning correct?
1. Insufficient; sum of all terms = 3124
2. Insufficient; Sum of all terms/n= 4

Combining 1 and 2 we get 3124/n=4, so n=3124/4, hence C
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by f2001290 » Sat May 19, 2007 11:36 am
Remember this formula

Average = Sum of the terms / No. of the terms.

A = S/N

1. gives us S
2. Gives us A

Using both we can find the no. of terms.
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