A bag contains 4 red and 3 green blocks. 3 blocks are randomly selected from the bag. Determine the probability that all three are red given that

i.) replacement occurs between the second and third selections

ii.) no replacement occurs

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- July 10th 2007, 06:03 PMsam48probability using permutations/combinations
A bag contains 4 red and 3 green blocks. 3 blocks are randomly selected from the bag. Determine the probability that all three are red given that

i.) replacement occurs between the second and third selections

ii.) no replacement occurs - July 10th 2007, 06:59 PMSoroban
Hello, Sam!

Quote:

A bag contains 4 red and 3 green blocks.

Three blocks are randomly selected from the bag.

Determine the probability that all three are red given that:

a) replacement occurs between the second and third selections

Second block is red: . . . . The second block replaced.

Third block is red:

Therefore:

Quote:

b) no replacement occurs

Second block is red:

Third block is red:

Therefore: