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BITSAT2011MathematicsProbabilityActual

If (A ) and ( B ) are mutually exclusive events and if ( P ( B )= 1 3 , P ( A B )= 13 21 ), then ( P ( A ) ) is equal to

Options

  1. A(1 / 7 )
  2. B(4 / 7 )
  3. C(2 / 7 )
  4. D(5 / 7 )

Correct answer

C. (2 / 7 )

Step-by-step solution

For mutually exclusive events ( P ( A B )= P ( A )+ P ( B ) P ( A )= 2 7 )

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