40% of people in one city leave their homes without locks. A thief has 8 locks, but one lock is a "dead key" that can unlock every house. If today a thief picked up a key and went to work in a house. Find the probability that the thief will succeed.
Added by Daniel S.
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Since there is only 1 "dead key" lock out of 8, the probability is 1/8. Show more…
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