Question 635123
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Hi,
randomly select 2 diskettes, one after the other , 
from a box containing {{{highlight(a)}}}diskettes of which 3 are unformatted,
Assumming no replacement
P(both unformatted) = {{{(3/a)*(2/(a-1))}}}
P(both formatted) = {{{((a-3)/a)*((a-4)/(a-1))}}}