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If A and B are not disjoint sets then n(...

If A and B are not disjoint sets then n(A`cup`B) is equal to

A

n(A)+n(B)

B

n(A)+n(B)-n(A`cap`B)

C

n(A)+n(B)+n(A`cap`B)

D

n(A)n(B)

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • If A and B are two given sets then A cap (A capB)^(c) is equal to

    A
    A
    B
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    C
    `phi`
    D
    A`capB^(c)`

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    A
    (A`cup`B)-B
    B
    A-(A`cap`B)
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    (A`cup`B)-(A`cap`B)
    D
    (A`cap`B)`cup`A`cup`B

  • If A and B are two sets then A cup B=A cap B if and only if

    A
    A`sube`B
    B
    B`sube`A
    C
    A=B
    D
    A`!=`B

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