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x can be 2, 3, 4, 5, 6. The number of ways in which sum of 2, 3, 4, 5, 6 can occur is given by the coefficients of `x^(2), x^(3), x^(4), x^(5), x^(6)` in <br> `(3x + 2x^(2) + x^(3))(x + 2x^(2) + 3x^(3)) = 3x^(2) + 8x^(3)+ 14x^(4) + 8x^(5) + 3x^(6)` <br> This shows that sum that occurs most often is 4.