michaelhidrogo michaelhidrogo

30-06-2018
Mathematics

contestada

A bag contains 11 orange cubes and 9 black cubes. Once a cube is picked, it is not replaced. What is the probability of choosing 2 black cubes?

A. 3/10 B. 3/20 C. 14/95 D. 18/95

Respuesta :

konrad509 konrad509

30-06-2018

[tex]|\Omega|=20\cdot19=380\\ |A|=9\cdot8=72\\\\ P(A)=\dfrac{72}{380}=\dfrac{18}{95}\Rightarrow \text{D}[/tex]

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