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Subsets and supersets - class-VIII

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Multiple Choice

The number of subsets of the set $A={ { a } _{ 1 },{ a } _{ 2 },.........{ a } _{ n }} $ which contain even number of elements is

  1. ${ 2 }^{ n-1 }$
  2. ${ 2 }^{ n }-1$
  3. ${ 2 }^{ n }-2$
  4. ${ 2 }^{ n }$
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