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AP EAMCET2003MathematicsProbability

If P(A B)=0.8 and P(A B)=0.3 , then P( A )+P( B ) is equal to:

Options

  1. A0.3
  2. B0.5
  3. C0.8
  4. D0.9

Correct answer

D. 0.9

Step-by-step solution

We have, P(A)+P(B)=P(A B)+P(A B)=0.8+0.3=1.1 1-P( A )+1-P( B )=1.1 P( A )+P( B )=2-1.1=0.9

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