vba programming

Giganews Newsgroups
Subject: vba programming
Posted by:  biker man (white…@aston.ac.uk)
Date: Tue, 28 Aug 2007

im writing a VBA programme where x = 2 in cell A3 and cell B3 = 5

and in cell C3

=IF(B3<=0,"B3 must be integer greater than zero",(A3^B3)/FACT(B3))

can anyone help me  write a VBA programmeto ensure that x from cell a3
and n from cell b3 return in cell c3 the value of x raised tot he n
divided by n factorial

where x is 2 and n is 5

many thanks as im struggling on how to do this