Posted by **daniel** on Thursday, March 3, 2011 at 7:18am.

An urn contains 4 red and 3 blue marbles. What is the probability when three marbles are selected randomly that all 3 will be red, if we select each marble

a) with replacement

b) without replacement

- Math - probability -
**Writeacher**, Thursday, March 3, 2011 at 7:37am
Please type your __subject__ in the **School Subject** box. Any other words, __including obscure abbreviations__, are likely to delay responses from a teacher who knows that subject well.

- lccc -
**Reiny**, Thursday, March 3, 2011 at 8:25am
with replacement:

prob = (4/7)(4/7)(4/7)

without replacement:

prob = (4/7)(3/6)(2/5)

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