advice 3 letter with 1 number domain name selection

[kmrock]

Are 3 letters with 1 number domains good?

 

[hawkeye]

3 letters and 1 number? or 3 letters with one being a number? (which wouldn't be 3 letters.)

 

[kmrock]

3 letters and 1 number? or 3 letters with one being a number? (which wouldn't be 3 letters.)

3 letters with 1 number, for example abc5.com

 

[kmrock]

3 letters and 1 number? or 3 letters with one being a number? (which wouldn't be 3 letters.)

3 letters with 1 number, for example abc5.com

Are there such patterns in demand ?