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Question
A letter lock consists of three rings each marked with ten different letters. Then how many ways it is possible to make an unsuccessful attempt to open the lock.
A letter lock consists of three rings each marked with ten different letters. Then how many ways it is possible to make an unsuccessful attempt to open the lock.
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Solution
The correct option is C 999
Required number of ways = Total attempts – successful attempts =10×10×10−1=999
Required number of ways = Total attempts – successful attempts =10×10×10−1=999
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