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OpenStudy (anonymous):
A stack of lumber has 30 pieces in the bottom row, 29 pieces in the next, and so on, with only one piece at the top row. How many pieces of lumber are in the stack?
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OpenStudy (bahrom7893):
it's 31*15
OpenStudy (bahrom7893):
|dw:1332104084908:dw|
OpenStudy (bahrom7893):
|dw:1332104113045:dw| keep pairing them up, ull get 15 pairs
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