Question

tina has to create a password for the security of a software program file.she wants to use a password with three letters. how many passwords are allowed if no letters are repeated and the password is not case sensitive
a.13800
b.15600
c17576
d.46800

Answer 1

How many letters are?

Answer 2

3 letters

Answer 3

And how many letters can we choose from?

Answer 4

i dont know it doesnt say

Answer 5

We have to choose from 26 letters, right?
A, B, C, D, E, ... and so on.
How can we use this?

Answer 6

yes and i dont know how to do this problem

Answer 7

26p3=15600

Answer 8

For the first letter, we can choose any of the 26 possibles.
For the second letter, we can chosse from 25 letters (we can't choose the one that we choose first)
And for the last, we can choose from 24 letters (we can't choose any of the ones that we had previoulsy chosen)

Answer 9

total letters 26
used =3
(since they are case sensitive repetition is not allowed)
26P3=15600

Answer 10

Isn't it?
26*25*24=15600?

Answer 11

Ok, same thing.

Answer 12

@rafabc02 it is

Answer 13

Was this useful? Do you undestand now how do we get that answer?

Answer 14

okay thanks

Answer 15

You are welcome!
(Thanks for the "best response")
Have a wonderful day!

Answer 16

yes i get it now !

Answer 17

Great!
Thanks!