number,x, from cell A3 and a positive  integer, n, from cell B3 then
returns into cell C3 the value of x raised to the power n divided by
n factorial.

where x in cell a3 =  2 and n in cell b3 = 5

im using this formula, but when i run it nothing happens, how do i
make this vba programme run and return the value?

this is the vba programme:

Public Function MyFunction(X As Double, N As Long) As Variant
 If (N <= 0&) _
   Then
     MyFunction = "N must be an integer greater than zero"
   Else
     MyFunction = (X ^ N) / WorksheetFunction.Fact(N)
   End If
End Function

or i can use this one, which one do you thinks better?

Sub test()
'checking B3:
If Range("B3") < 1 Or Int(Range("B3")) <> Range("B3") Then
MsgBox "B3 should be an integer greater than 0"
Exit Sub
End If
Range("C3") = Range("A3") ^ Range("B3")
Application.WorksheetFunction.Fact (Range("B3"))
End Sub

how do i delcare x and n variables into  working vba code so that
the vba can run, im not sure how to decalre them, how you do it. at
the minute nothing happens the vba doesnt code it. do i need to put
it
into a macro.

the cell a3 and b3 are on a normal sheet 1 on excel and i need to use
vba to calculate into cell C3 the value of x raised to the power n
divided by n factorial.

I just want to no how to make the code run, im really struggling
please please please help!!!!!

if any one can help can u explain in great detail so i can get it
right thank you