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uma urna contem 7 bolas brancas, 5 bolas pretas e 4 bolas vermelhas. qual a probalidade de retirarmos, ao acaso, uma bola preta?
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uma urna contem 7 bolas brancas, 5 bolas pretas e 4 bolas vermelhas. qual a probalidade de retirarmos, ao acaso, uma bola preta?

User Seerumi
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A urna contém 16 bolas no total. 5 deles são pretas.

A probabilidade de retirarmos uma bola preta é

5 / 16 = 0.3125 = 31.25% .


User Rnso
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