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Let S={1,2,3,4}. The total number of uno...

Let S={1,2,3,4}. The total number of unordered pairs of disjoint subsets of S is equal to :

A

25

B

34

C

42

D

41

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • If A={1,2,3,4,5} , then the number of proper subsets of A is

    A
    120
    B
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    D
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    A
    6
    B
    8
    C
    `2^9`
    D
    None of these

  • Total number of lone pair of electrons in I_3^- ion is

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    3
    B
    6
    C
    9
    D
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