Question 634787
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
box containing {{{highlight(a)}}} diskettes  of which <u>3 are unformatted</u>,
randomly select 2 diskettes, one after the other 
with replacement:
P (both unformatted) = {{{(3/a)(3/a)}}}
P (both formatted) = {{{((a-3)/a)((a-3)/a)}}}
without replacement:
P (both unformatted) = {{{(3/a)(2/(a-1))}}}
P (both formatted) = {{{((a-3)/a)((a-4)/(a-1))}}}