a Letter lock contains 5 rings each marked with four different letters . The number of all possible iunsuccesful attempts to open the lock is

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 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 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 letter lock consists of three rings each marked with 10 different letters. No. of ways to make an unsuccessful attempts to open the lock is

A letter lock consists of three rings marked with 15 different letters . If N denotes the number of ways in which it is possible to make unsuccessful attempts to open the lock, then

A letter lock consists of three rings each marked with 5 different letters. Number of maximum attempts to open the lock is

A letter look consists of three rings marked with 15 different letters. If N denotes the number of ways in which it is possibel to make unsuccessful attempts to open lock, then

A letter look consists of three rings marked with 15 different letters. If N denotes the number of ways in which it is possibel to make unsuccessful attempts to open lock, then

A letter lock has 3 rings each containing 6 different letters. What is the maximum number of false trials that can be made before the lock is opened?

A letter lock contains 4 rings, each ring containing 5 letters. All possible trails are made to open the lock and the lock opens in only one way. The probability for the lock to open is