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Question

A letter lock consists of three rings each narked with 10 different letters. In how many nays it is possible to make an unsuccessful attempt to open the lock ?


Solution

The total number of ways to make ttempt to open the lock = 10×10×10=1000. The number of ways to successfuly open the lock = 1 The number of ways to make an nsuccessful attempt to open the lock = 1000 -1 = 999. Hence, required number of ways to make an unsuccessfuly attempt to open the lock is 999.


Mathematics
RD Sharma
Standard XI

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