EXHIBIT 3.1


                             CHAPMAN AND CUTLER LLP
                             111 WEST MONROE STREET
                             CHICAGO, ILLINOIS 60603


                                  May 27, 2008


Van Kampen Funds Inc.
522 Fifth Avenue
New York, New York  10036


                     Re: Van Kampen Unit Trusts, Series 761
                         ----------------------------------

Ladies/Gentlemen:

   We have served as counsel for Van Kampen Unit Trusts, Series 761 (the
"Fund"), in connection with the preparation, execution and delivery of a trust
agreement dated May 27, 2008 (the "Trust Agreement"), among Van Kampen Funds
Inc., as depositor (the "Depositor"), Van Kampen Asset Management as supervisor,
and The Bank of New York, as trustee (the "Trustee"), pursuant to which the
Depositor has delivered to and deposited the securities listed in the schedule
to the Trust Agreement with the Trustee and pursuant to which the Trustee has
provided to or on the order of the Depositor documentation evidencing ownership
of units (the "Units") of fractional undivided interest in and ownership of the
trust of the Fund (the "Trust"), created under said Trust Agreement.

   In connection therewith we have examined such pertinent records and documents
and matters of law as we have deemed necessary in order to enable us to express
the opinions hereinafter set forth.

   Based upon the foregoing, we are of the opinion that:

     1.   The execution and delivery of the Trust Agreement and the execution
          and issuance of certificates evidencing the Units in the Trust have
          been duly authorized; and

     2.   The certificates evidencing the Units in the Trust, when duly executed
          and delivered by the Depositor and the Trustee in accordance with the
          aforementioned Trust Agreement, will constitute valid and binding
          obligations of the Trust and the Depositor in accordance with the
          terms thereof and such Units, when issued and delivered in accordance
          with the Trust Agreement against payment of the consideration set
          forth in the Trust prospectus, will be validly issued, fully paid and
          non-assessable.

   We hereby consent to the filing of this opinion as an exhibit to the
registration statement (File No. 333-150083) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
registration statement and in the related prospectus.

                                                         Respectfully submitted,


                                                          CHAPMAN AND CUTLER LLP