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Question -

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



Answer -

The total number ofways to make an attempt to open the lock is = 10 ├Ч 10 ├Ч 10 = 1000

The number ofsuccessful attempts to open the lock = 1

The number ofunsuccessful attempts to open the lock = 1000 тАУ 1 = 999

Hence, required numberof possible ways to make an unsuccessful attempt to open the lock is 999.

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