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Q.

The key for a door is in the bunch of 10 keys. A man attempts to open the door by trying keys at random discarding the wrong key. the probability that the door is opened in the 5th trial is

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a

0.6

b

0.1

c

0.2

d

0.5

answer is A.

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Detailed Solution

The key for a door is in the bunch of 10 keys

P (The door is opened in the 5th trial)

=910×89×78×67×16=110=0.1

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