Question

How many 5 digits numbers are possible from the digits 0,1,2.....7 if each digit is used only once?

Answer 1

@terenzreignz

Answer 2

how many digits are these : 0, 1, 2.... 7 ?

Answer 3

8.

Answer 4

Okay then 7*7*6*5*4

Answer 5

you want a 5 digit number, how many ways u can fill first space ?

Answer 6

wait the .....means 0,1,2,3,4,5,6,7 right?

Answer 7

yes...

Answer 8

See, for the first place you can choose any of the 7 digits except 0. for the second you have 7 choices and so on...

Answer 9

^ No that can't be 8!

Answer 10

8!/3!

Answer 11

8.7.6.5.4.3.2.1?

Answer 12

from where is 3! coming from?

Answer 13

^ You can't have 0 in the first place. Since, 09 or 095 is treated as 1 and 2 digits numbers repectively.

Answer 14

cuz its 5 spots
8*7*6*5*4

Answer 15

It's 5 spots so won't it be 5!?

Answer 16

or8!/(8-5)! =8!/3!

Answer 17

oh my

Answer 18

@ganeshie8 teach your student!

Answer 19

Why are we subracting? :o

Answer 20

gotta love dan.

Answer 21

how many ways we can fill first space ?