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A letter lock consists of three rings each marked with 10 different letters. Maximum number of ways to make unsuccessful attempts to open the lock is

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479

999

899

568

answer is B.

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Detailed Solution

A letter lock consists of three rings

Each ring is marked with 10 different letters.

Therefore total number of attempts=10³

Maximum number of unsuccessful attempts to open the lock = $10^{3} - 1$

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