Check if range already added to sheet

[x65140]

E10 holds the formula, but when i expand it to include A,B,C columns i can't get it to work
Want to check if the data in columns A3:C3 are found in A10:C999

When ADD RECORD is clicked, msgbox pops up saying record already exists
if not, it will add the record to the next blank line

attachment included

[x65140]

Found resolution: A2&B2&C2,A10:A100&B10:B100&C10:C100 added a range for each & and that worked