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Mathematics
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Help please! Will Fan and medal
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here
use first formula i tihnk
yes use permutaion
i don't understand the formula
what's n; what's r
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what's !
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
in other words, n=10 r=9
in that formula
i suppose you know what 10! means factorial
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what's ! mean
\[\frac{10!}{(10-9)!}\]
10! means 1*2*3*4*5*6*7*8*9*10
5!=1*2*3*4*5
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exactly!
its a pretty big number!
thank you :D i'll remember and book mark this
welcome
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