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题库 / GMATAdvanced-DS-1
The cardinality of a finite set is the number of elements in the set. What is the cardinality of setA?
(1)2 is the cardinality of exactly 6 subsets of set A.
(2)Set A has a total of 16 subsets,including the empty set and set A itself.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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GMATCLUB上关于（2）充分的两种解释：
nC0+ nC1+nC2+......+nCn=16
2n2n=16
---OR
Any element can either present in the subset or not.
Hence total number of subsets- 2*2*2...n times= 2n。
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