Let \\\\(A\\\\), \\\\(B\\\\), and \\\\(C\\\\) be the set of people who like \\\\(product\\ A\\\\), \\\\(product\\ B,\\ and\\ product\\ C\\\\) respectively.Accordingly,\\\\( n(A) = 21, n(B) = 26, n(C) = 29, n(A ∩ B) = 14, n(C ∩ A) = 12\\\\),\\\\(n(B ∩ C) = 14, n(A ∩ B ∩ C) = 8\\\\)The Venn diagram for the given problem can be drawn as above.It can be seen that number of people who like product C only is\\\\(={29 – (4 + 8 + 6)} = 11\\\\)