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Mathematics 20 Online
OpenStudy (anonymous):

Help please! Will Fan and medal

OpenStudy (anonymous):

here

OpenStudy (alexandervonhumboldt2):

use first formula i tihnk

OpenStudy (xapproachesinfinity):

yes use permutaion

OpenStudy (anonymous):

i don't understand the formula

OpenStudy (anonymous):

what's n; what's r

OpenStudy (anonymous):

what's !

OpenStudy (xapproachesinfinity):

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

OpenStudy (xapproachesinfinity):

in other words, n=10 r=9

OpenStudy (xapproachesinfinity):

in that formula

OpenStudy (xapproachesinfinity):

i suppose you know what 10! means factorial

OpenStudy (anonymous):

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

OpenStudy (anonymous):

what's ! mean

OpenStudy (xapproachesinfinity):

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

OpenStudy (alexandervonhumboldt2):

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

OpenStudy (alexandervonhumboldt2):

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

OpenStudy (xapproachesinfinity):

exactly!

OpenStudy (xapproachesinfinity):

its a pretty big number!

OpenStudy (anonymous):

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

OpenStudy (xapproachesinfinity):

welcome

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