it depends on whether repetition is allowed, and also
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送交者: steven 于 2008-04-30, 03:20:38:
回答: 我有A，B，C，D四个BOOLEAN，只许用AND和OR和扩号，可以有多少种组合？ 由 Enlighten 于 2008-04-29, 15:20:26:
if two logically equivalent expressions are counted as one. The simple answer for that is infinity, if no restriction posted on it.
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