Probability of 3rd drawing is red?

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SUMMARY

The probability of drawing a red ball from a box containing 7 balls (red and white) varies based on whether the drawing is with or without replacement. If the drawing is with replacement, the probability remains constant at x/7, where x is the number of red balls. Conversely, if the drawing is without replacement, the probability changes depending on the outcomes of previous draws. The initial probability, without considering prior draws, is still x/7.

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  • Understanding of basic probability concepts
  • Familiarity with the terms "with replacement" and "without replacement"
  • Knowledge of conditional probability
  • Basic combinatorial principles
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  • Learn about combinatorial probability and its applications
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There are 7 balls in box--red and white.
What is probability of p-th drawing is red?
{p=1,...7}

Condition:return of previous drawing and not
returning of previous drawing.

Please help me these two conditions please
Thanks in advance
 
Last edited:
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You are the same person who did the "10 boys and girls in line"?

The same thing happens here- if x of the seven balls is red and the drawing of samples is "with replacement", then the probability any one draw is red is x/7. If the drawing is "without replacement" then the probability depends on the previous history. The "a-priori" probability without that information is still x/7.
 

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