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根據二項式定理∵99^1999=(98+1)^1999=98^1999+C(1999,1)98^1998+.+C(19991998)*98^1+198^1999+C(1999,1)98^1998+.+C(19991998)*98^1能被98整除,當然能被7整除∴99^1999除以7後,餘數為1∴今天是週三,再過99的1999…
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