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JEE Advanced Model Paper 3 with solutions for online practice

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Suppose you have 10 keys and you wish to open a door and try the keys one ata time, randomly until you open the door. Only one of the keys will open thedoor.

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Question : 60

Total: 60

If you do not eliminate the each unsuccessful trial from the remaining keys theprobability that the door gets opened on the 5th trial, is given by:

1
2
1
10
10
‌
C5 . (
9
10
)4 .
1
10
(
9
10
)4 .
1
10

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