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P(Red ball & then Blue Ball)

Probability theory and statistics
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P(Red ball & then Blue Ball)

Postby nycmath » Thu Sep 03, 2026 11:29 pm

A box has 4 green balls, 2 yellow balls, 8 red balls and 9 blue balls. What is the probability of randomly selecting a red ball followed by a blue ball?
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Re: P(Red ball & then Blue Ball)

Postby Eigenvalue » Thu Sep 03, 2026 11:36 pm

Are the balls replaced? If so, the answer is:
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Re: P(Red ball & then Blue Ball)

Postby Eigenvalue » Thu Sep 03, 2026 11:37 pm

If not:
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Re: P(Red ball & then Blue Ball)

Postby Eigenvalue » Thu Sep 03, 2026 11:38 pm

Regardless:
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Re: P(Red ball & then Blue Ball)

Postby nycmath » Thu Sep 03, 2026 11:46 pm

Eigenvalue wrote:Are the balls replaced? If so, the answer is:


Balls not replaced.

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Re: P(Red ball & then Blue Ball)

Postby nycmath » Thu Sep 03, 2026 11:47 pm

Eigenvalue wrote:If not:


Yes, you got it.
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Re: P(Red ball & then Blue Ball)

Postby nycmath » Thu Sep 03, 2026 11:47 pm

Eigenvalue wrote:Regardless:


Thanks.

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