If {a_n} is a null sequence, and for each n, b_n is the arithmetic mean of the first n terms of {a_n}, then prove {b_n} is a null sequence.

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- March 7th 2008, 01:07 PMnatesterProof analysis
If {a_n} is a null sequence, and for each n, b_n is the arithmetic mean of the first n terms of {a_n}, then prove {b_n} is a null sequence.

- March 8th 2008, 12:26 AMCaptainBlack
- March 8th 2008, 02:58 PMThePerfectHacker
If fact is then too. Where is an arithmetic sequence.

- March 9th 2008, 01:20 AMCaptainBlack