Find the factorial of a number using vb script

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n=cint(inputbox(“Enter a number”))
dim f
f=1
if n<0 data-blogger-escaped-br="" data-blogger-escaped-then=""> msgbox “Invalid number”
elseif n=0 or n=1 then
msgbox “The factorial of given number “&n&” is :”&f
else
for i=n to 2 step -1
f=f*i
next
msgbox “The factorial of given number “&n&” is :”&f
end if