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A letter lock consists of 4 rings each m...

A letter lock consists of 4 rings each marked with 10 different letters, the number of ways in which it is possible to make an unsuccessful attempts to open the lock is

A

8999

B

9999

C

4799

D

5689

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The correct Answer is:
B
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-PRACTICE EXERCISE
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