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Q.

The key for a door is in the bunch of 20 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 7th trial is

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a

0.1

b

0.2

c

0.05

d

0.6

answer is C.

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Detailed Solution

P(A)=1n=120=0.05
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