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Q.

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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a

479

b

999

c

899

d

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 =103−1

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