Assume your numbers data is running in A2 down
Put in B2: =IF(COUNTIF(A$2:A2,A2)1,"x","")
Copy down. Col B will flag "x" for any duplicates present, ie the 2nd
instance onwards.

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"connect4u" wrote:
my excel sheet contains numbers in each cell some of which may be repeated,
how do i mark the ones that are entered more than once