Let n>3 be a positive integer. Equilateral triangle ABC is divided into n2 smaller congruent equilateral triangles (with sides parallel to its sides). Let m be the number of rhombuses that contain two small equilateral triangles and d the number of rhombuses that contain eight small equilateral triangles. Find the difference mād in terms of n. geometryrhombussymmetryratiocombinatorics unsolvedcombinatorics