Asked by Josh_DB9

a box contains 25 computer diskettes, 5 of which are double density and the remiander are high density. A second box contains 15 diskettes, 10 double density and 5 high density. A box is selected at random and then two diskettes are chosen randomly from the selected box. What is the probability that both diskettes are high density?
Answered by bobpursley
The probabality of selecting a HD is

(20+5)/(25+15) * (24)/(39)

There are longer and more complicated of working this out.

Answered by Josh_DB9
can you explain?
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