If the maximum number of trials required to open all locks when there are n locks and n keys is 105, then n =

The maximum number of trials to open n locks by n keys is 105. Then n is

A number lock can be unlocked by a 3 digit code, each digit of the code could be any one of 0, 1 ....,9. What is the maximum number of trials required to unlock, if the following are known (a) the last digit (b) the sum of the first two digits is always less than or equal to the third?

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

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 has 3 rings and each ring has 5 letters. Determine the maximum number of trails that may be required to open the lock.

A number lock has 3 rings and each ring has 10 digits 0,1,2,...9. Find the maximum number of unsuccessful attempts that can be made by a thief who tries to open the lock without knowing the key code

A number lock has 3 rings and each ring has 9 digits 1, 2, 3,……, 9. Find the maximum number of unsuccessful attempts that can be made by a thief who tries to open the lock without knowing the key code.

Let n be the number of trials that an event E occurred and m be the total number of trials, then find the probability of the event E.