A safe and vault lock needs to be open.
there are 100 numbers on the dial. ( 0~99 )
The cue is the numbers are whole numbers. (includes zero)
The 3 numbers must be in order to open up the lock
... eg , 40,60,90 not the same as 90 ,60 ,40
Numbers may be repeat,
eg : 20, 20, 80 or 20 80 20 or 20 20 20
In total, how many possible sets of numbers are there ?
Pls show maths workings, and thanks !
sorry abt the 10s ... and thanks !
so is 1000 possible combinations ...
This is a true account of one of my friend's mother safes, she forgot her numbers but remember clearly that the numebrs are in 10s ...
Guess she will have to try 1000 times before her safe would open