Question

Help please!
Will Fan and medal

Answer 1

here

Answer 2

use first formula i tihnk

Answer 3

yes use permutaion

Answer 4

i don't understand the formula

Answer 5

what's n; what's r

Answer 6

what's !

Answer 7

there number 0 to 9
you need to make a code of 9 numbers
so count tell the last meaning you have 10 choices for the first one
9 for the second tell you exhausted 9

Answer 8

in other words, n=10 r=9

Answer 9

in that formula

Answer 10

i suppose you know what 10! means
factorial

Answer 11

3628800
http://www.mathpapa.com/algebra-calculator.html

Answer 12

what's ! mean

Answer 13

\[\frac{10!}{(10-9)!}\]

Answer 14

10! means 1*2*3*4*5*6*7*8*9*10

Answer 15

5!=1*2*3*4*5

Answer 16

exactly!

Answer 17

its a pretty big number!

Answer 18

thank you :D i'll remember and book mark this

Answer 19

welcome