The random variable X is said to have a lattice distribution if there exist a and I) such that X takes values in the set L(a,b)={albm:m=0,:|:1,.... The span of such a variable X is the maximal value of b for which there exists a such that X takes values in L(a, 5). Suppose X has a lattice distribution with span b. Show that |X(27T/b)| = 1