Excel- Not Allow Column to accept Duplicate data and length of text not more than 28 characters -


i have column in excel, have put 2 data conditioning it.

  1. for range of cells, should not accept duplicate values.
  2. for same range of cells, should not allow user enter more 28 character of text length.
  3. it can allow cell blank.

i tried selecting cell range , go data ->data validation-> allow - custom formula = =and(countif($b:$b,b5)=1,len(b2)<29) not working. formula, allowing enter duplicate data , enter data more 28 characters.

enter image description here

hey please write formula,

=and(countif(b$4:b$20,b4)=1,len(b4)<=28,isnumber(b4+0))


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