Question

A bag contains 6 black marbles and 4 white marbles. Sally takes out a black marble and does not put it back. What is the probability that the next marble she picks will also be black

Answer 1

`(5)/(9)`

Explanation:

`Total\ marbles=10\\\\Black=6\\\\White=4`

After removing one black marble:

`Total\ remaining\ marbles=9\\\\Remaining\ Black=5\\\\P(Black)=(Remaining\ Black\ marbles)/(Total\ remaining\ marbles)\\\\P(Black)=(5)/(9)`