A costemer forgot a four digit code fir an atm he remember that this codeconsists of the digits 3,5,6, and 9 find the largest possible no: of trials to obtain the correct code
Answers
Answer:
the possible number of trails = 24
Step-by-step explanation:
Let the four digit ATM pin be A B C D
Now ,
Since he remembers there are 3, 5, 6 and 9 in this code
So, A B C D will contain all four distinct digit among 3, 5, 6, 9
Now,
For position of A there are all the four possibilities , that is,
A can have any of the 4 digits
Since position of A is filled now,
For position of B there are there possibilities , that is,
B can have 3 digits
Since positions of A and B are filled now,
For position of C there are two possibilities , that is,
C can have 2 digits
Since positions of A, b and C are all filled now,
For position of D there is only digit left
so, D can have 1 digit that is left out
⇒ A B C D
4 * 3 * 2 * 1
So the possible number of trails = 4*3*2*1 = 24