Question

How many ways can you select a 4-digit passcode without repeating any digit?

Answer 1

tyty

Answer 2

Think of this, how many numbers can you have at 1st place?
How many at 2nd, 3rd, 4th?

Answer 3

48 nigg nigg

Answer 4

LMAO Mertsj

Answer 5

You are all wrong so far

Answer 6

5040

Answer 7

5040? O.o seems too hight

Answer 8

high*

Answer 9

@sudonick
Can you answer my question?

Answer 10

i gave up and looked it up

Answer 11

http://www.algebra.com/algebra/homework/Sequences-and-series.faq.question.42557.html

Answer 12

@Andras i dont quite understand, i appreciate the help though, try explaining another way?

Answer 13

10x 9 x 8 x 7
That is, if the first digit can be 0

Answer 14

That article sums it up nicely

Answer 15

yep

Answer 16

Clear?

Answer 17

i wish i could give you all metals for the help lol thanks

Answer 18

@Andras yes