EXHIBIT 16.1


                               POWER OF ATTORNEY


      Each  person whose signature appears below hereby constitutes and appoints
the Secretary  and  Assistant  Secretaries  of  FEDERATED MDT SERIES and each of
them, their true and lawful attorneys-in-fact and  agents,  with  full  power of
substitution and resubstitution for them and in their names, place and stead, in
any and all capacities, to sign the Registration Statement on Form N-14 relating
to  the  proposed reorganization of Federated Large Cap Growth Fund, a portfolio
of Federated Equity Funds, into Federated MDT Large Cap Growth Fund, a portfolio
of Federated  MDT  Series,  and  any  amendments  to the Registration Statement,
including post-effective amendments; and to file the  same,  with  all  exhibits
thereto  and  other  documents in connection therewith, with the Securities  and
Exchange  Commission by  means  of  the  Securities  and  Exchange  Commission's
electronic  disclosure  system  known as EDGAR, granting unto said attorneys-in-
fact and agents, and each of them,  full power and authority to sign and perform
each and every act and thing requisite  and  necessary  to be done in connection
therewith, as fully to all intents and purposes as each of  them  might or could
do  in  person,  hereby ratifying and confirming all that said attorneys-in-fact
and agents, or any  of  them,  or  their  or  his substitute or substitutes, may
lawfully do or cause to be done by virtue thereof.


SIGNATURES                           TITLE                                  DATE



/S/ John F. Donahue
John F. Donahue                      Trustee                       April 3, 2007



/S/ J. Christopher Donahue
J. Christopher Donahue               President and Trustee
                                     (Principal Executive Officer) April 3, 2007



/S/ Richard A. Novak
Richard A. Novak                     Treasurer
                                     (Principal Financial Officer) April 3, 2007



/S/ Thomas G. Bigley
Thomas G. Bigley                     Trustee                       April 3, 2007



/S/ John T. Conroy, Jr.
John T. Conroy, Jr.                  Trustee                       April 3, 2007



/S/ Nicholas P. Constantakis
Nicholas P. Constantakis             Trustee                       April 3, 2007



/S/ John F. Cunningham
John F. Cunningham                   Trustee                       April 3, 2007


Federated MDT Series - Power of Attorney for Merger of Federated Large Cap
Growth Fund into Federated MDT Large Cap Growth Fund
Page 2




/S/ Lawrence D. Ellis, M.D.
Lawrence D. Ellis, M.D.              Trustee                       April 3, 2007



/S/ Peter E. Madden
Peter E. Madden                      Trustee                       April 3, 2007



/S/ Charles F. Mansfield, Jr.
Charles F. Mansfield, Jr.            Trustee                       April 3, 2007



/S/ John E. Murray, Jr.
John E. Murray, Jr.                  Trustee                       April 3, 2007



/S/ Marjorie P. Smuts
Marjorie P. Smuts                    Trustee                       April 3, 2007



/S/ John S. Walsh
John S. Walsh                        Trustee                       April 3, 2007



/S/ James F. Will
James F. Will                        Trustee                       April 3, 2007



/S/ Thomas M. O'Neill
Thomas M. O'Neill                    Trustee                       April 3, 2007