October 2019 2 30 Report
En una urna hay 5 bolas negras, 4 blancas y 2 azules, se sacan dos bolas al azar, ¿cuál es la probabilidad que ninguna sea blanca?<br />
A) 21/55.<br />
B) 11/55.<br />
C) 5/11.<br />
D) 7/11.

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