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# more ranging variable problems

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## more ranging variable problems

(OP)
i'm currently using mathcad to calculate probabilities.  the formula i'm using used 3 differing variables(p,N,n).  in part 1 p and N are constant and n ranges from 0-5.  now i know how to make n a ranging variable, my problem is when trying to solve the equation it has a problem with me asking for n! with the message 'this must be a vector or scalar'  any help guys?

### RE: more ranging variable problems

You are probably trying to use a range variable as a vector.  It is not a vector.  To make a vector variable V from a range variable n,

Vn:=n

### RE: more ranging variable problems

(OP)
still got a problem: i labeled a vector variable(Vn=n) and wrote n=0;5 - no help.  then tried n=(0,1,2,3,4,5) and still problems..now it says n needs to be an integer...any suggestions?

### RE: more ranging variable problems

(OP)
nvm, figured it out...

### RE: more ranging variable problems

Nice of you to share the answer with the group.

### RE: more ranging variable problems

(OP)
if you're being sarcastic..and i think you are, here is what i was trying to do and what i did to get what i wanted:

Simple probability function with changing variable:
k=5
n:=1..5
vn:=n  (that's V sub n)
vn= (will print a table of all values) again v sub n
p:=5
P(n,k,p):=[k!/(vn!(k-n)!)][p^n][1-p]^(k-n)
P(n,k,p):= (will print probabilities)

what i ended up doing was I hadn't labeled P as a function of variables P(n,k,p).  when i had it as just P=...., it wouldn't do anything - seemed to clear up my 'n isnt an integer problem'

did that help?

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