4. How many subsets are there of a set consisting of *n* elements?
(A)n
(B)n-1
(C)n2
(D)2n .
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統計: 尚無統計資料
統計: 尚無統計資料
4. How many subsets are there of a set consisting of *n* elements?
(A)n
(B)n-1
(C)n2
(D)2n .