I have three tabs within one spreadsheet, Column A holding the same data,
I.E. Last Name. I need to know if the Last Name is found on the other tabs.
Here is the formula I have so far:

=VLOOKUP(A2,DEC!A1:O94,1,TRUE)

Right now the result is not providing a True/False rather the value in
Column A.

Any assistance you can provide would be appreciated!!