Question

9. Reed will randomly select two marbles from the

bag one at a time without replacement. What is the
probability that Reed will select a 3 first and then a 5

Answer 1

So assuming they are numbered from 1-12 :

The probability of Reed selecting a 3 is 1/12
And the probability of Reed selecting a 5 is also 1/12

So, the probability of Reed selecting a 3 then a 5 is 1/12 x 1/12 = 1/144