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OpenStudy (anonymous):
Four positive integers a, b, c, and d satisfy ab + a + b &= 524, bc + b + c &= 146, cd + c + d &= 104, and abcd=8!. What is a - d?
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OpenStudy (anonymous):
ignore & please
OpenStudy (rational):
scroll to page 11 http://billingswest.billings.k12.mt.us/math/AMC%201012/AMC%2012%20work%20sheets/2001%20AMC%2012A%20ws-15.pdf
OpenStudy (anonymous):
Good recollection thanks!
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