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If the terms of a sequence are t1, t2, t3,...., tn (note

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If the terms of a sequence are t1, t2, t3,...., tn (note [#permalink] New post 10 Jul 2007, 17:30
If the terms of a sequence are t1, t2, t3,...., tn (note that the 1, 2, 3,...., and n are subscripts), what is the value of n?

(1) the sum of the n terms is 3124
(2) the average of the n terms is 4


thanks guys!
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 [#permalink] New post 10 Jul 2007, 17:41
St1:
Insufficient. We have no idea what type of sequence this is.

St2:
All we know is sum = 4n. Insufficient.

Using st1 and St2, we can solve for n. Sufficient.

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 [#permalink] New post 10 Jul 2007, 18:58
thanks for the help on this one. i was just spacing out!
  [#permalink] 10 Jul 2007, 18:58
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If the terms of a sequence are t1, t2, t3,...., tn (note

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