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Question
A letter lock consist of three rings, each ring is marked with ten different letters. Then in how many ways it is possible to make unsuccessful attempt(s) to open the lock?
A letter lock consist of three rings, each ring is marked with ten different letters. Then in how many ways it is possible to make unsuccessful attempt(s) to open the lock?
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Solution
The correct option is B 999
Three rings are marked with 10 different letters, therefore total number of attempts present ->(10×10×10)=1000
In the lock only one patrern is correct. So, successful attempt=1.
Therefore, unsuccessful attempt (1000−1)=999
option (b) is correct
Three rings are marked with 10 different letters, therefore total number of attempts present ->(10×10×10)=1000
In the lock only one patrern is correct. So, successful attempt=1.
Therefore, unsuccessful attempt (1000−1)=999
option (b) is correct
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