In terms of Section 2(74), mixed supply means two or more individual supplies of goods or services or any combination thereof, made in conjunction with each other by a taxable person for a single price where such supply does not constitute a composite supply. The illustration of mixed supply appended to Section 2(74) is as follows:
A supply of a package consisting of canned foods, sweets, chocolates, cakes, dry fruits, aerated drink and fruit juices when supplied for a single price is a mixed supply. Each of these items can be supplied separately and is not dependent on any other. It shall not be a mixed supply if these items are supplied separately.
(ICAI FAQ PUBLICATION 06-09-2017 TAX LIABLITY ON COMPOSITE AND MIXED SUPPLY : FAQ NO. 11)