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OpenStudy (anonymous):
Arithmetic series: In a triangular pile of logs, the top row contains one log. each row below the top row contains one more log than the row above. if the bottom row contains 21 logs, how many logs are in the pile?
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OpenStudy (anonymous):
1+2+3+...+20+21 = ?
OpenStudy (anonymous):
ohh..
OpenStudy (anonymous):
but I don't know the whole pile.
OpenStudy (anonymous):
I get it now. Thank you!
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