Question

A bag contains 6 brown, 8 white, and 4 black marbles. Each time you take a marble

out, you do not put it back into the bag. Find the Probability of pulling a black marble
and then another black marble. (In simplest form--always!)
P(black, black)

Answer 1

4.44

Explanation:

Total NM of ball=18,

black ball=4

p(black,black)=?

p(black,black)=p(b)+p(b)

4/18+4/18=4.44ans

Answer 2

• 2/51

Explanation:

Total number of marbles:

• 6 + 8 + 4 = 18

Probability of black marble:

• p = 4/18 = 2/9

Without replacement, we have 3 black out of 17 total, then probability of the second black is:

• p = 3/17

Required probability is:

• p(black, black) = 2/9*3/17 = 2/51