+201 1.How many diagonals does a convex dodecagon 12 (-gon) have?
2.Kathy tossed a coin 8 times and got 3 heads and 5 tails. How many different sequences of results could she have gotten?
3. There are n different points on a circle. The number of triangles whose vertices are among the n points is positive, and equal to the number of hexagons whose vertices are among the n points. What is n?
4. There are 7 dots on a circle. What is the maximal number of intersection points outside the circle created by connecting these points with lines?
