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A letter lock contains three rings each marked with fifteen different letters, find in how many ways it is possible to make an unsuccessful attempt to open the lock.

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3374

3864

3924

3446

answer is A.

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Detailed Solution

A letter lock contains there rings each method with fifteen different letters ,
So, there can be 15x15x15 no. of attempts
Now, there can be only one successful combination ∴ Total number of wrong attempts = 3375 - 1
= 3374

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