There are three similar-looking bowls: in the 1st - 4 white balls and 7 black ones, in the 2nd - only white balls (the number of balls is unknown), in the 3rd - only black balls (the number of balls is unknown). Someone comes at random to one of the bowls and takes out one ball from it. Find the probability that this ball will be black.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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There are three similar-looking bowls: in the 1st - 4 white balls and 7 black ones, in the 2nd - only white balls (the number of balls is unknown), in the 3rd - only black balls (the number of balls is unknown). Someone comes at random to one of the bowls and takes out one ball from it. Find the probability that this ball will be black.

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