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GMATPrep Test 1 - DS Sequence

This topic has 2 member replies
medenica Newbie | Next Rank: 10 Posts Default Avatar
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GMATPrep Test 1 - DS Sequence

Post Thu Jan 11, 2007 10:55 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    If the terms of a squence are t1, t2, t3, ... , tn, what is the value of n?

    1) The sum of the n terms is 3,124
    2) The average of the n terms is 4

    1 and 2 together are sufficient but can someone actually work out the problem? What are the formulas through which n is derived?

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    Argen Junior | Next Rank: 30 Posts Default Avatar
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    Post Thu Jan 11, 2007 11:17 pm
    2) suggests that 4 = (sum of n terms) / n
    1) states that (sum of n terms) = 3124
    Therefore n = (sum of n terms) / 4 = 3124 / 4 = 781

    medenica Newbie | Next Rank: 10 Posts Default Avatar
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    Post Thu Jan 11, 2007 11:43 pm
    Oh wow... how embarrassing. I was really complicating things - it's funny how missing what's being asked for does that...

    tnx!

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