Slader In this problem we want to calculate the number of two element lists (a, b) we can form using the numbers 0, 1, . . . n with a < b. (a) Show that the answer is (n + 1)n/2 by considering the number of two-element lists (a, b) in which a < b or a > b. (b) Show that the answer is also 1 + 2 + 3 + · · · + n. Taken together (a) and (b) prove the formula Xn k=1 k = (n + 1)n 2

How do i do this activity, is appreciated

Fill in the blank 1. a rhombus is a rectangle a) always b) sometimes c) never 2. a square is a quadrilateral a) always b) sometimes c) never 3. a trapezoid is a kite a) always b) sometimes c) never 4. a quadrilateral is a kite a) always b) sometimes c) never 5. a square is a rhombus a) always b) sometimes c) never 6. a parallelogram is a rectangle a) always b) sometimes c) never

Why does the shape of the distribution of the weights of russet potatoes tend to be symmetrical?