A donut shop sells 3 varieties of donuts: glazed, chocolate, and vanilla. Assume that it has an unlimited supply of each variety. How many different ways are there to select a dozen donuts from these 3 varieties if we do not order more than 6 donuts of any particular variety

5x + 6-7x + 86x + -9-7x + 2-3x + -54x+123x-6-2x+-86x+312x+20

The sum of the angles in a triangle is 180°. this is called the angle-sum property.the sum of the lengths of any two sides of a triangle is greater than the length of the third side. similarly, the difference between the lengths of any two sides of a triangle is less than the length of the third side.the side opposite to the largest angle is the longest side of the triangle and the side opposite to the smallest angle is the shortest side of the triangle.