Question

Suppose a jar is filled with 7 red marbles and 3 green marbles. What is the probability of pulling out 2 green marbles in a row if the marbles are not replaced after they're pulled out

Answer 1

P = 1/15

Explanation:

Extractions:

first green marble:

`p=(3)/(10)`

second green marble:

`p=(2)/(9)`

Combination:

`p=((3)/(10) )((2)/(9) )=(6)/(90) =(1)/(15)`

Hope this helps