A Letter Lock Consists Of Three Rings Each Are Marked With 10 Different Letters. Find The Number Of Ways In Which It Is Possible To Make Unsuccessful Attempts To Open The Lock.

The number of ways of making each of the ring = 10 different letters

Number of unsuccessful attempt = Number of total attempt – Number of successful attempt

= 10 * 10 * 10 – 1

= 1000 – 1

= 999.

Therefore, the possibility to make an unsuccessful attempt to open the lock is 999.

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