FEDERATED MDT SERIES

                           Federated Investors Funds
                              5800 Corporate Drive
                      Pittsburgh, Pennsylvania 15237-7000

                               November 29, 2007


EDGAR Operations Branch
U.S. Securities and Exchange Commission
Division of Investment Management
100 F Street, N.E.
Washington, DC  20549-4720

     RE:  Form N-14
          FEDERATED MDT SERIES
          Federated MDT Small Cap Growth Fund ("Fund")
             1933 Act File No. 333-134468

Dear Sir or Madam:

       Transmitted  herewith  for filing pursuant to the Securities Act of 1933,
as  amended,  ("1933 Act"), is the  Registration  Statement  on  Form  N-14  for
Federated MDT Series ("Trust").

       The purpose  of  this  Registration  Statement  is  to register shares of
beneficial interest of the above-named Fund under the 1933 Act. These shares are
being registered pursuant to an Agreement and Plan of Reorganization pursuant to
which  the  Federated Technology Fund, a portfolio of Federated  Equity  Funds.,
will transfer substantially all of its assets to the Fund, in exchange for Class
A Shares, Class  B  Shares  and  Class  C  Shares of the Federated MDT Small Cap
Growth Fund.

       In connection with the review of this  filing  by staff of the Securities
and Exchange Commission, the Trust acknowledges the staff's view that: the Trust
is responsible for the adequacy and accuracy of the disclosure  in  the filings;
staff  comments  or changes to disclosure in response to staff comments  in  the
filings reviewed by  the  staff  do not foreclose the Commission from taking any
action with respect to the filing;  and the Trust  may not assert staff comments
as a defense in any proceeding initiated  by  the Commission or any person under
the federal securities laws of the United States.

       We would appreciate receiving any comments  you  may have by December 14,
2007. If you have any questions on the enclosed material, please do not hesitate
to contact me at (412) 288-7574.

                                                     Very truly yours,


                                                     /s/ M. Allison Miller
                                                     M. Allison Miller
                                                     Senior Paralegal
Enclosures