FORM OF OPINION
                                                                      EXHIBIT 11

                                                                  Reed Smith LLP
                                                                  Liberty Tower
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                                                       Pittsburgh, PA 15222-3779
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November 29, 2007

The Trustees of
Federated Equity Funds
5800 Corporate Drive
Pittsburgh, PA 15237-7000

Ladies and Gentlemen:

       Federated  MDT  Small  Cap  Growth  Fund  (the  "Fund"),  a  portfolio of
Federated MDT Series (the "Trust"), proposes to acquire the assets of  Federated
Technology Fund, a portfolio of Federated Equity Funds , in exchange for Class A
Shares, Class B Shares and Class C Shares of the Fund ("Shares") pursuant to the
Agreement and Plan of Reorganization dated _______, 2008 ("Agreement"), included
as  an  exhibit  to  the  registration statement of the Trust filed on Form N-14
under the Securities Act of 1933, as amended ("N-14 Registration").

        As counsel we have  reviewed  the  appropriate documents relating to the
organization of the Trust, its registration  under the Investment Company Act of
1940, the registration of its securities on Form  N-1A  under the Securities Act
of 1933 and participated in the drafting of the N-14 Registration. Specifically,
we have examined and are familiar with the Declaration of  Trust ("Declaration")
and  the  Bylaws  of  the  Trust,  and  such other documents and records  deemed
relevant  for the purpose of rendering this  opinion.   We  have  also  reviewed
questions of  law  as  deemed necessary or appropriate by us for the purposes of
this opinion.

        Based upon the foregoing, it is our opinion that:

        1.   The Trust is  duly  organized  and validly existing pursuant to the
             Declaration, and the Fund is a separate  series  of  the Trust duly
             constituted  in  accordance with the applicable provisions  of  the
             Investment Company Act of 1940 ("1940 Act") and the Declaration. .












        2.   The  Shares  which are  currently  being  registered  by  the  N-14
             Registration may  be  legally and validly issued in accordance with
             the Declaration upon receipt  of consideration sufficient to comply
             with the provisions of the Declaration  and  subject  to compliance
             with the 1940 Act, and applicable state laws regulating the sale of
             securities.  Such  Shares, when so issued, will be fully  paid  and
             non-assessable.


        We hereby consent to the  filing of this opinion as an exhibit to the N-
14  Registration  referred  to above and  to  any  application  or  registration
statement filed under the securities  laws  of  any  of the States of the United
States.

                                  Very truly yours,


                                  Reed Smith LLP