blanks counting as 0

patrick.zrno_at_defence.gov.au
Date: 08/12/04 

Date: Wed, 11 Aug 2004 21:47:14 -0700

i am makeing a work*** to calculate scores for eg if a
core is over 200 it is a fail if its under 200 its a pass
but if there is no entry i want it to stay blank, the
formula i used to calculate it is

IF(AND(N100<=200, N100>1),"PASS","FAIL"

can anyone help please