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JEE Advanced Model Paper 3 with solutions for online practice

Paragraph - 2 :

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.

Question : 59

Total: 60

If you eliminate each unsuccessful trails then the probability that the door getsopened on the 5th trial, is given by:

1
10
1
5
1
2
10
‌
C5 . (
9
10
)4 . (
1
10
)

Validate

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