Question

A number lock contains two rolls with each roll having the digit 0 to 9 .find the probablility that the lock can be opened sucessfully in first attempt

Answer 1

It is given that a number lock system has two rolls

Each roll has 10 digits with the numbers starting from 0 to 9

Therefore, total number of possible combinations of pass code = 10*10 =100

Probability of opening the lock in first attempt will be 1/100

Hope it helps.