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Question

A letter lock consists of three rings each marked with 10 different letters, the maximum number of  unsuccessful attempt's to open the lock is 
  1. 899
  2. 479
  3. None of the above
  4. 999


Solution

The correct option is D 999
Total number of different attempts possible is =10×10×10=1000
But among 1000 attempts the lock gets unlocked only at once.

maximum number of Unsuccessful attempts =10001=999

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