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A letter lock consists of three rings ea...

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?

A

482 divides N

B

N is product of 3 distinct prime numbers

C

N is product of 4 distinct prime numbers

D

N is product of 2 distinct prime numbers

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The correct Answer is:
A, B
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