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Daniel.M
 
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Default Eliminating every 25th row

Bob,

=SUMPRODUCT(--(MOD(A1:A25,25)<1),A1:A25)


Didn't you left some ROW()s out there! ;-)

=SUMPRODUCT(--(MOD(ROW(A1:A25),25)<1),A1:A25)

Regards,

Daniel M.