Question

Stop here !!!! and help me with this problem , very hard !!!!

see the attachment !!!

Thank for your help

Answer 1

5 out of 10 marbles are bule
If the first marble is blue and is not replaced, there are 9 marbles left with 4 blue marbles
And therefore, the probability will be:


`(5)/(10)` ×
`(4)/(9)`
=
`(20)/(90)`
It can be simplified further:
=
`(2)/(9)`